Here's a story I would have only imagined could appear in something like The Onion, but according to The Daily Mail (which I admit sort of reminds me of The Onion), it really happened.
Some British guy got hauled off an airplane and questioned for three hours because he played London Calling by the Clash and Immigrant Song by Led Zeppelin in a taxi, and these songs scared the taxi man. I admit the lyrics to "Immigrant Song" are scary, but only because they're so incredibly silly--I included a link to the lyrics so you can see for yourself in case you're unfortunate enough not to be thoroughly familiar with Zeppelin III.
Read it and weep: all you need now to be to be suspected of terrorist sympathies is a fondness for classic punk and rock.
Thanks to Spike for sending me the link.
