What do you want to delete from your brain?

Sometimes I wish I could delete useless information that has slowly accumulated in my brain to make room for stuff that really matters. It makes me sad that I can still sing the whole Pokerap and every other song from the Pokemon CD, but memorizing stuff for biochemistry was nearly impossible. 150 Pokemon? No problem? 22 Amino acids and their structures? Gaaahhh! If only we made silly child jingles about biochemistry…

Though I do have one useful song I learned – a little ditty that sings every state in the US alphabetically! I’m amazed that I still remember it from 5th grade.

What useless knowledge would you delete from your brain if you could?