Anyone know what book this was?

[Lord Seth]

Okay, there was a book I read waaaaaaaaaay back in Elementary school, about 15 years ago. I didn't read the whole thing, but the plot was that there was this club of really smart guys who played pranks on people. One was to take a mannequin (I think it was a mannequin) and put it on top of a building and have it make fun of people (who would be fooled into thinking it was a real person on top of the building).

That's pretty much all I've got. Can anyone remember what this was?

[Weezer]

By any chance is it this (http://en.wikipedia.org/wiki/The_Mad_Scientists%27_Club)?
If so I had that book as a kid, very entertaining, reread it until it fell apart. (Though back then that was standard for just about every book I owned)