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 would join in a world with my buddy (any game) then I'd drop all my stuff and power off, when I joined back I had all my stuff and the stuff on the ground. It did eventually corrupt out data as we found out later though. We also used tanks in Halo 3 forge to shove into elephants and lift them up on top of buildings.