Kind of a weird one, but it really sticks in my mind.
In grade school, my frined and I were nuts about Nobunaga's Ambition on the NES. We'd play for hours and hours uintil like 3 in the morning.
My favorite part was when my ninja finally successfully assassinated a rival daimyo.
I nearly died when he snuck in, jammed his katana in the guy, and wiggled it around. God, that felt so satisfying.