Yah one time I had my very last bowl packed before I was going to rehab. And I was smoking out of a pop can (all my pieces got taken) and I got like the biggest hit and accidently did the most noobish thing ever, I blew the smoke in the can and all the weed blew out.
ha ha ha loser. but dont feel bad ive dont that before to and it sucks especially when it's the only weed you have left.