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’d spend MP matches in Halo trying to get out of bounds once upon a time. Sometimes with Power Weapons to Grief/Camp, sometimes just to explore the maps for the sake of it.