A little while back, before the finale of the Breaking Bad series, this joke made the rounds on the internet:
Bryan Cranston seems to have run with an idea on those lines in this alternate version of the Breaking Bad finale:
Older readers who watched TV in the 1980s will recognize the reference to the May 1990 finale of the Newhart TV series, when the central character, hotel owner Dick Loudon (played by Bob Newhart) is hit in the head by a golf ball. In the next scene, he wakes up with a start in his previous TV series, The Bob Newhart Show, as psychiatrist Bob Hartley in bed with his wife Emily, where we discover that the entire Newhart series was just a dream: