Don't feel bad "lascar", I did the same thing once when my bedroom slide wouldn't go in. I'd been working on it in the driveway and since it's a small slide I didn't start the engine, just turned the key to accessory, like I've done before. I tried everything I could think of, thinking all kinds of bad things and major $$$ repairs.
Then I noticed the stupid emergency brake wasn't applied.
Bob 2006 Monaco Camelot 40PDQ
US Navy Carrier Battlegroup 1959/1963
Summer in Colorado, Winter Texas Gulf Coast