I missed the reporting of this when it first happened. It comes from the category of "you couldn't make it up". Apparently Slovak security officers were testing baggage screening at Poprad-Tatry Airport in central Slovakia by placing RDX, a military-grade explosive, in innocent passengers' bags. They planted eight 200 gramme packages but somehow only recovered seven. The eighth "bomb" was carried to Dublin.
The unwitting passenger reclaimed his bag at Dublin unaware of the explosives and it wasn't until three days later the Slovaks admitted what they had done. And even then they just texted baggage handlers at Dublin airport and then faxed an ambiguous message to the guarda - leading to the innocent passenger being arrested.
Details here: Independent