Mawaru no penguindrum ( I think that is how it is spelled) Nichijou ( not the highschool boys one. Its name is nichijou
Paranoia agent and perfect blue( anime movie) both are psychological thrillers, makes u go wtf is going on. Different POVs in PA, plot twist and MC going crazy in PB. And also Blood C for gore and an unexpected ending.
...you kidding me. there's so many great series out there that need a next season and they give FLCL a next one? (/_- ) the manga is even more WTF, to be honest (and upon seeing the title, yes, i also thought of FLCL xD) sakamoto desu ga, maybe? kakumeiki valvrave.... vampires x mechas is one of the weirdest combinations i've seen if you exclude certain BL movie...
Mmm, the closest wtf anime i can think of is Witchcraft Works and Trouble Chocolate. Maybe Keijo!!! Haven't watched it yet though
Depends on the kind of WTF you're looking for: Gintama Sougeki no Soma JoJo's Bizarre Adventure One-Punch Man Gurren Laggan FLCL Time Bokan 24 Toriko
O I almost forgot fighting foodons now that was something even my young mind found strange back in the day
You must definitely try Arakawa Under The Bridge. You got a man in a kappa costume who pretends like kappa, thinks like a kappa, and apparently a "Village Chief" A macho man in a Sister dress who behaves like a mafia. Weird cute man-bird. A man whose face is oddly shaped- .... err, looked like a crescent moon. And many more, all in one.... just Under the bridge. What are you waiting for?
I think Prince of Tennis and Kuroko no Basuke was pretty WTF >.> I mean, I grew up watching Prince of Tennis and it made me think that people are always so chatty and full of BS when playing tennis....... which is pretty WTF if you ask me