Baggage screeners at Chicago's O'Hare International Airport discovered the unexpected in the luggage of teenagers returning from London. 

Drugs, booze, cash?  Nope!  World War 1 explosives!  The 16 and 17 year olds found the old artillery shells at a French World War 1 artillery range during a field trip. 

They attempted to transport the shells home in their checked baggage.

A bomb disposal crew found the shells to be inert with no chance of blowing up.

After officials seized the bombs, the teens were questioned and allowed to travel home to Seattle.  No criminal charges were filed against the youths.