http://www.youtube.com/watch?v=2gDSwZhvu_c
Not the funniest product, but definitely the funniest infomercial: Beastie Boys Hello Nasty
Silliest infomercial product I think could be the Tajazzle (crystals for your pubis) or the Comfort Wipe. Considering how lazy we are, I think owning stock in the Comfort Wipe might be a smart investment plan.