Cheeky Bleeder at the Gym

As in some bloke who was cheeky, not literally someone bleeding everywhere.

I'd just finished a 2k row and jumped off to hit one of the resistence machines (I'd been told it's best not to let the heart rate lower too much between peices of equipment), when some guy hopped on the rower and managed to begin before the display zeroed. I didn't really notice until a couple of mins later when a friend of his walked in and congratulated him on how well he was doing and how much he'd improved, and the blasted git didn't put him right.

Anyone else had someone take credit for something they'd done?