HAHHAHAHAHAHAHAHAH. "That must be the jackfruit ghost!" "No son.. that's a transvestite."
I can't think of many that are really funny off the top of my head that I could post here.
EDIT: I removed the link of the 'most disturbing' one I could think of because I think it fits more in just 'downright disturbing' really than funny or weird. I forget disturbing and weird are a different plane.
A couple funny Japenesse ads me and a friend found a while back.
Enjoy
[ame]http://www.youtube.com/watch?v=xUgJ9hEufGU&feature=related[/ame]
and
[ame]http://www.youtube.com/watch?v=a6tSyDHXViM&feature=related[/ame]
and
[ame]http://www.youtube.com/watch?v=AR-Iz1fts5M&feature=related[/ame]