Ah, here are more detailed information about the monkey wrench puzzle:
Boris would have changed the puzzle for the German version and asked Ron to change the graphics to turn the monkey into something that would fit the German word “Engländer” (= Englishmen).
Deja vu. I’m sure you’ve written this before. And I’d bet I replied that, when in my teens, as soon as I realized what a Monkey Wrench was, I thought it would have been cool to add a puzzle in the italian version in which guybrush traded the monkey with the parrot in the shop on booty, in order to use it on the pump.
Sure. I remember this dialogue between you and @guga, too. It was in the comment section of a post in the TWP dev blog. 
@Someone interestingly enough, Englander (Englishman) would have fitted also for the italian version “Chiave inglese” (english key literally).
Also, from a developer point of view (less effort much gain) a strong hint in the manual for this puzzle which sounds absurd in other languages would have fitted too.
Yes, it’s happened before. It’s almost like the monkey wrench puzzle is a recurring topic among MI2 fans 
As far as I remember I had to use everything with everything too back than. I’m not sure. But I think the monkey did not look like something I could use on the pump to me when I was a kid.
In the German version there was a hint in the library catalog, AFAIR. At least Boris complaint there on a card about the difficult translation. 
I’m almost sure there was the same in the Spanish version. I remember there was a card saying something like “how to use a monkey as a monkey wrench” (in Spanish).
I can’t remember if there was something similar in the italian version.
That’s not exactly what I had in mind when thinking about a “strong” hint but… better than nothing for sure!
I love how people can’t accept that it’s a leap of logic. The steps are:
It’s the logic equivalent of this:
It literally breaks at least three of Ron Gilbert’s own rules of bad adventure game design 
I’m perfectly accepting of the fact that it seemed like a leap of logic for you, but for me that’s a grossly incorrect analysis of the logic chain.
Maybe I read Tintin:
Maybe my wife played Zelda:
Perhaps I wasn’t explicit enough about it, but my argument was that even if you didn’t connect the waterfall and the pump, it’s just asking to be turned on or off just to see what will happen. My argument was not that this is literally the chain of logic.
While the “use monkey on pump” may be a leap, using the banana on the metronome is not. It’s the most logical thing to do. You have a banana, you have a monkey, you’re a pirate that loves messing with people*. It may be a leap in the puzzle sense (you don’t have an actual reason to do so), but it’s not in the roleplaying sense. And Monkey Island 2, as all the best adventure games, is not just about puzzles.
*EDIT: it’s also the reason why it makes total sense to put Kate’s flyer in the Wanted poster.
Why do you think so? With the banana you could attract a monkey or you could give the banana to a monkey. But it’s not logical to stick a banana on a metronome.
Even letting the monkey playing the piano wasn’t obvious or at least logical AFAIR (for us at that time). Why should a monkey play a piano?
I have to add that I don’t remember the hints that were given. So it might be logical within the game. But the whole puzzle chain per se isn’t.
What story is that? Great art, I want to start reading those…
Like I said, it was all perfectly logical to me except for the “why did the monkey turn into a wrench” part. Whereas for my wife the whole thing was a perfectly logical puzzle chain.
But like @Guga says, I’m playing Guybrush the asshat prankster. I’m not playing me.
Probably Prisoners of the Sun, maybe Seven Crystal Balls (it’s a two-parter).
But you don’t think like him. You’re trying this during the play (“What would Guybrush do?”). But most of the time you think what you/one would do in that situation. While playing, you are trying to transfer known solutions into the game. And if you don’t know for example what a “monkey wrench” is, the puzzle won’t be logical to you.
I don’t remember what happens when you try to give the banana to the monkey. But I remember thinking that the monkey was too concentrated on playing that the metronome was the right thing to sabotage.
Right, but I’m just messing with the monkey to see what kind of funny thing will happen. I’m not doing it for any particular reason. I’m a rowdy youth walking around kicking trashcans and pocketing unguarded property.
Having messed with the monkey, which curiously turned into a wrench, I had one when I needed it.
Monkey + banana is as simple as it can get. Monkey is too focused on metronome to notice banana presents a logical path to take. Imo the Monkey Island solution to the try everything problem is to make everything funny so you want to try all kinds of stuff to see what will happen, much more so than making everything “logical” or having a “reason” to do something. It’s par for the course.
Maybe MI2 is just a flawed game. I certainly experienced several “monkey wrench” moments in it myself. But the monkey wrench wasn’t one of them. Most notably or at least most memorably the Dinky island jungle puzzle with the audio.
(By contrast, in Tales that puzzle was easy because it was just a repeat.)
He’s just there playing as soon as you reached part 2. It’s a given fact. Realizing that you need to stop him playing is part of the puzzle.
Whoa, I have no idea what you’re referring to. It’s time for me to play MI2 again. I forgot a lot of it.
Definitely Tintin and the temple of Doom!
I mean “Il tempio del sole”