What's the most useless thing you still have memorized?

The mitochondria is the powerhouse of the cell.

Row Row Row Your Boat - in Latin

My childhood phone number from the 60s which is now my wifi password.

“Mares eat oats and does eat oats and little lambs eat ivy” even though I have no idea what that means.

ROY G BIV - red, orange, yellow, green, blue, indigo and violet … colors of the rainbow.

The quick brown fox jumps over the lazy dog.