I reckon that I've got a very bizarre sense of humor. For example, I just laughed out loud at this line from Rankin's Retromancer:

"Achtung! Achtung! Achtung!"
"What is all this achtunging?"

And I laughed so loud it made my mother turn and look at me strangely, for the TV was on and what was showing wasn't in the least funny (it was a Korean talk show and I understand jackshit Korean). So I guess that the older I get, the stranger my behavior becomes. Laughing at not-very-funny-things, being averse to door handles, being obstinate about using the online banking service to pay my credit card bill. That's just the tip of the iceberg.