The only episodes of Bill and Mandy I've seen are the "Grim Reaper comes for the hamster" and the "slug Mandy getting her power from cinnamon" ones. I thought the hamster one was pretty bleh (and borderline irritating), and the slug one was just disturbing.
I've never seen Fairly Oddparents.
I wouldn't have anything against Foster's Home For Imaginary Friends if it didn't give us that "I Pooted" line they put on those billboards. I don't care for the art style, but that one has gotten a couple laughs out of me, like the one where the kid's older brother got the imaginary friend Red (I didn't see the full thing, I was watching it on the TV at the NMTech cafetria, but had to leave to make it to my next class), and at the beginning he ponders how to make an Imaginary Friend, a fairy pizza appears and begins to say something, and he grabs her and scarfs her down while she screams in agony.
Where are these lemmings going? The
Super Nintendo Super Shire! Hop in line and follow them there!