While performing oral sex on a woman, make letters of the alphabet with your toung and have her guess what they are.
I played the alphabet game on Suzie last night and she guessed every one.
While having sex with a girl, have her say the alphabet from a to z without moaning at all. The common thing to do is to toy around with the speed and what not to make it more difficult. you can reverse roles and have the girl give you oral etc.
"Me and Jane played the alphabet game last night. she did bad which means i was good"