Apparently the security screener at congressional office buildings had trouble keeping the screening steps straight. Here, I thought it was three simple steps:
1. Bag goes into X-ray machine
2. Check for dangerous items on monitor
3. If clear, bag exits machine and is returned to owner

It seems steps 2 and 3 were flipped:
1. Bag goes into X-ray machine
2. Bag exits machines and is returned to owner
3. If dangerous item on monitor, chase down person and shutdown entire building

CNN.com - Toy gun shuts down U.S. House office building - Oct. 30, 2003