Aladdin. Just before Aladdin and Abu enter the Cave of Wonders, it gives a stern warning: "Touch nothing but the lamp!" Exactly why isn't made clear until Abu grabs a giant, conspicuous ruby, which sets off its Berserk Button. Let's just say that our heroes were pretty lucky to have met the Flying Carpet (that even tried, but failed, to stop Abu from touching the ruby).
Scar from The Lion King uses this on Simba (a cub at the time) to lure him to the elephant graveyard. True, he doesn't realize that maybe Uncle Scar isn't trustworthy...
In Titan A.E., Gune manages to make one for himself in a fit of sleep-inventing. It includes a highly unstable substance, it has a button on it, and he has no idea what will happen if he presses it.
In Shrek Forever After, Donkey comes across a plate of fresh waffles in the middle of the forest. Shrek is smart enough to know that it's a trap. Donkey…ignores his warnings.
Raggedy Ann & Andy: A Musical Adventure: You're in Looney Land, a place full of a race of people whose hat is playing practical jokes. You've already fallen for several of those jokes. You're running away from the person who won't stop playing jokes on you. Suddenly a giant tongue unrolls in front of you, displaying a "WELCOME" mat on its tip. Shouldn't you be smart enough to not step on the mat? In this case, apparently not.
Storks: Even the person who sets up the trap mocks Junior for falling for the obviously fake house in an abandoned warehouse district.
Junior: I thought it was a gentrifying neighborhood!
In The Boss Baby, when Tim and the Boss Baby sneak into a secret room at Puppy Co., they find the supposed plans for the Forever Puppy lying in a manila envelope right out in the open on a dais with a spotlight on them and fall for it hook, line and sinker. They swap it with another envelope that the Boss Baby drips drool on and is then lowered away. When they open the folder, it turns out to have nothing but a piece of paper inside it that says something like "Gotcha!" They then have a cage dropped on them, followed by them being ejected down a trapdoor.