Like things you did that you think nobody else did.
In GTA San Andreas I would RP as a truck driver. I would steal a semi, find a trailer, drive around on all the freeways from city to city, drive the speed limit, and make stops at stores and shit pretending I'm delivering a load.
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In the original Tomb Raider on Sega Mega drive, if you dived of a high platform onto a hard surface, obviously you'd die, but the character made a noise like a short orgasm. We dived of high things lots. Simple times ;)