No blame at all.
There are many answers to this question in addition to the answer supplied by Google.
For instance.
He accidently locked himself in his greenHOUSE
He bricked himself into one of the cupboards.
He built his house in the desert.
He built a house on the moon.
He lived next door to Jack Dee (Drier than a tumble dried on full pelt)
He sowed up his mouth when his wife told him to put a sock in it.
He was desperately ill and noone bothered to knock on his door.
True riddles usually only have one answer, but the google one is acceptable too.