Bricks with RFID that makes your phone ping if you pick it up?
in lieu of rioting, or between peaceful protests, if you're in Boston, you can go over to the aquarium and stand beside the seal tank. The seals will swim by repeatedly showing off, and watching the tourists. you stand next to them eye to eye as they swim by just a few short feet in front of you behind the glass.
oh maybe it's still closed becuase of the quarantine.
anyway, a better choice for a night in Boston would be to walk over to see the seal tank. It's pretty much outside and there all the time.
why do harbor seals swim upsided down a very lot of the time?
http://askanaturalist.com/why-do-the-seals-swim-upside-down/