Clothing alert!

It seems a long time since we've had a "you couldn't make it up" story, but here's a good one. A man was prevented from boarding a plane at Heathrow because he was wearing a T-shirt with a drawing of a cartoon character holding a gun on it. He had to change into another top before he was allowed through security. BAA are "investigating what happened" - there seems to be some confusion as to whether the original T-shirt was perceived as a security threat, or whether it was a matter that it might cause upset or offense to other passengers. Can I suggest they also investigate the possibility that their security staff need their heads examined?