2 wireless keyboards, and 1 wireless mouse playing Counter Strike. 1 telephone went across the room into a wall because it dared to ring while on COD4. I killed a motherboard because I got the wrong BIOS from MSI. I also fried an old Athlon 64 3000+, because I wanted to see how long it lasted without a heatsink on (answer = not long at all !).
And a little more personally, an old "friend" punched me in the face because I beat him and then laughed at him on an old coin-op arcade machine about 20 years ago !