[SSJup81]

Hm, weirdest series I've seen are:

Excel Saga
Puni Puni Poemi
FLCL (I only saw like an ep, though, when it aired, I never could watch it cause of the time)
Negima!?
Crayon Shin-chan
Oruchaban Ebichu
Jungle wa Itsumo Hale Nochi Guu
Jungle wa Itsumo Hale Nochi Guu DELUXE
Jungle wa Itsumo Hale Nochi Guu FINAL (The RPG ep is really funny and random)
Azumanga Daioh (I love this series...though odd)

And that's about all I can really think of right off.