My mother used to have a Bluetooth speaker in our car that she took with her. It wasn't deliberately shaped that way, but with the silhouette, the color, and the volume it produced, we ended up dubbing it 'the hand grenade'.
After the hand grenade finally broke, my mother got a nice JVC speaker, a long cylinder. It was promptly named 'the pipe bomb'.
For context, my mother is the most bland, inoffensive Midwest Christian white lady you will ever meet. She has an unusual sense of humor that comes out in the strangest ways. She laughed her ass off all the way through the FNAF games because she thought the animatronics were funny.
I think the TSA just hates people with a personality, period.