I seem to remember a couple of guys getting convicted for terrorism related activity because it Turned out they had participated in Paint ball games.
Ah, here it is:
"Three American Muslims accused of training for holy war against the United States by waging paint ball battles in the Virginia woods have been convicted of conspiring to support terrorism.
Prosecutors today said the three were part of a "Virginia jihad network" that used paint ball games in 2000 and 2001 to train for holy war around the globe.
After the September 11 attacks, the group allegedly focused efforts on defending the Taliban.
Two of the defendants were accused of travelling to Pakistan to train with a terrorist group.
Today's convictions will likely result in some of the longest prison terms the government has obtained in its war on terrorism. "
http://www.smh.com.au/articles/2004/03/05/1078378960411.html?from=storyrhs&oneclick=true