1950's - none really.

1960's
"Classical Gas" by Mason Williams
"They're Coming to Take Me Away, Ha-ha!" by Napoleon XIV (Weird. I love it.)

1970's
"Afternoon Delight" by Starland Vocal Band (C'mon! Anchorman!)
"Kung Fu Fighting" by Carl Douglas
"Play that Funky Music" by Wild Cherry
"The Entertainer" by Marvin Hamlisch

1980's
"867-5309/Jenny" by Tommy Tutone
"Cum On Feel The Noize" by Quiet Riot
"Der Kommissar" by After the Fire (English cover version of a German hit by Falco) (It. Won't. Get. Out. Of. My. Head.)
"Don't Worry Be Happy" by Bobby McFerrin

1990's
"Bittersweet Symphony" by The Verve (I LOVE this song)
"Mmm Mmm Mmm Mmm" by Crash Test Dummies (I don't know why, but I like it.)

2000's
meh.