The entire alphabet with ILF added at the end allowing you to come up with several options and could be played as a drinking game resulting in much hilarity.
Teacher - Now Johnny, say the alphabet for the class
Johnny - A,B,C,G,F,X,Q
Teacher - Now Johnny, thats not the alpha bet
Johnny - I only know the ILF-abet:
AILF - Alien I'd Like to Fuck (good for the Star Trek and Star Wars fans)
BILF - Bitch I'd Like to Fuck (more like BILHF (hate)
CILF...you get the idea