For all those catchy theme songs/songs that are impossible to get out of your head. Talk about any funny stories that happened because of that song...

The Catchiest theme I can think of is the fricken Sailor Moon opening. I don't know how many times that song creeps into my head. Once that song made me fail a test. I was completly focused for once and I hear a random noise sound at the back of my mind... then a bass riff... then the worst part "Fighting Evil By Moonlight, Finding Love By Daylight" then worse... The funniest thing is I hadn't heard anything about that one show for about a decade, more or less, and BANG all my concentration shoved down one anime spiral... at least it made the class go by faster...