Sorry, I just had to post this one.
In an attempt to go one better at smuggling explosives onto an aircraft, a suicide bomber has an enema and replaces the entire contents of his lower bowel with Semtex.
Despite appearing nervous and suspicious, he passes through all the sophisticated automatic detection equipment and feeling very confident, approaches the hand baggage check.
The baggage checker looks through his hand luggage and sizes him up.
"Sorry mate", the baggage checker says , "You can't board the aircraft"
"But why not? - You haven't found anything in my luggage"
"I know" says the checker - but we're well trained and I can tell that you're carrying more than 100ml of shampoo"