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> I hope someone attaches Bluetooth speakers to their shoes and locks every cart in target, so they have to remove the system.

Friends did this college in like 2005. Cambridge area, Shaws Market I think. I imagine the hardware setup was a bit different. All the details are hazy but I recall their lock transmission signal had a huge range and locked all carts in a wide area.

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Based on what's still around, likely the one (now rebranded a Star Market, same holding company) in Porter Square, right by Porter Square station.

Based on what I recall, I believe there was one on the southeastern end of Green Street, a bit between Central and Kendall Square, barely northwest of MIT's primary campus area on the corner Massachusetts Ave and Vassar Street. That location has apparently closed in recent years.

Around that year, or maybe even earlier, I remember reading an article about how to DIY one of those devices with a PIC microcontroller and wreck havoc on the store. It might have been something very similar to this:

https://www.instructables.com/EMP-shopping-cart-locker/

It might been the same text that somebody copy/pasted there, sounds vaguely familiar.

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