Knock Knock! Who's there? Dave Dave who? Dave holds back tears as he realises his mother's Alzheimer's is getting worse. Note: This anti-joke is submitted to commemorate the new Alzheimer's treatment, and the immanent loss of a source of much comedic humour - aged dementia.

I've decided to write a 'knock knock' joke about Jehovah's witnesses. "Knock, Knock, Knock , knock knock knock knock knock "

*knock knock* whos there? sir theres been an accident. theres been an accident who?

"You've reached 911" Knock knock "Sir ple-" Knock knock "This is not-" Knock knock "ok, who's there?" Ben "Ben who" Ben shot real bad "NICE"