Pingu, look at it from the bright side... You won't bash the top of your skull on the doorframe if you jump through it. I was like, "weeee" *Jump* *BONK* "OWGODDAMMIT". Also worth noting was the crackling sound from my neck.
I've also lost count over how many times i've stood up from a hunched over position, only to crack my head against an inclined ceiling. I think my skull is starting to harden. >.>