You MEMORISE the context of all the "history of the _____" books in BGII.
you try to make up stats for yourself; then, make stats for everyone around you, and condescendingly say to your little brother "bah, a mere 15 STR". You interpret the puzzled look on his face as a lack of INT.
You hex-edit the game to put in porn movies whenever you're supposed to be having sex. Then you edit the movies to change all the faces to game characters' faces
You search through sewers, guarded buildings, and graveyards for lots of impressive goodies. Upon finding some hobo's rags, you proudly proclaim: "Cloak of the Sewers!" and expect to be turned into a mustard jelly.
Upon finding a grave, you look for stakes and then wait for the little sword symbol to appear.
You start muttering some words in the middle of the street really loudly. When you see police rushing at you, you exclaim in anger: "Must I get that stinking license in EVERY city!!!!"