A friend once forgot a bare PCB TV-b-gone in a coat pocket while traveling EU to US. He noticed it right at the first checkpoint. They asked what it is, laugh

A friend once forgot a bare PCB TV-b-gone in a coat pocket while traveling EU to US. He noticed it right at the first checkpoint. They asked what it is, laughed at the response, and went "eh, as long as there are no wires dangling off it, we don't care." He stuffed it in a bag and had no further issues. Why the wires would've made a difference is beyond me...