I hope that should I ever be put under a coma and wake up, I'd just act as if I was waking up. Group around me, I'd simply say "what the hell you all looking at?" and proceed to try and get up and leave, stating "I'd love to stay and chat, but I've had enough of you people." Or some other grumpy remark, and sign myself out from the hospital and try to go home.
They'd hold me back, but I'd just be pretty damn grumpy.