I used to use " translationparty.com [1]" which created a humorous effect by translating from English to Japanese and back again via Google Translate, until it reached equilibrium. What other humorous web applications do you know of?
(Websites of jokes, funny youtube videos, etc. are off-topic for this question; it must be an actual application which is humorous. Question is Community Wiki.)
Unicornify - http://unicornify.appspot.com/use-it
The Dialectizer - http://www.rinkworks.com/dialect/
Is It Christmas? - http://isitchristmas.com/
Let Me Google That For You - http://lmgtfy.com/
O'Reilly Maker - http://www.oreillymaker.com/
Destroy Sites - http://bored.com/destroysites/
http://www.googlegooglegooglegoogle.com.br/
Easy way to open four independent frames in your current tab; feel free to browse to this app again within one of the frames to get four more frames within that one.