When the joke was on Harvey Kneeslapper:

[SesameStoner]

you can watch the video of the confetti in the bucket on youtube.com you just have to find it ive watched it there before

 

[MartyMuppets]

Harvey Kneeslapper was a very funny character.
As far as I seem to recall the jokes he played that didn't backfire were the ones which resulted in a letter or a number being slapped upon someone's shirt or head. But all other jokes went wrong for him. If anyone knows of any exceptions to this norm please share them with me.

 

[TheJimHensonHour]

it's so funny but he wasn't good for kids seriously...I used to play those pranks on my mom and boy would she get mad at me lol heheh