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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I am cursed to have bad hats, I play as Gundalf the gun wizard. I am one hell of a pilot, so it’s customary for me to fly under every bridge I see. Though being the gun wizard I must punch every boss I see.