It depends on the school, but here in the US it is generally expected that the majority of students return home for the summer. Most universities have housing available over the summer but it is limited and generally reserved for those with disabilities and graduate students who are expected to attend the school for 4+ years. Most college students only go for a year or two.

The silicon die could easily chip a tooth as well, the stuff is insanely hard.

While this could work, please don’t go firing a laser powerful enough to set shit on fire randomly into the air. It’s like firing a gun, that laser will fuck up whatever it hits and you don’t know what’s behind that flag. Easy way to kill a plane full of people by instantly and permanently blinding both pilots. I would look into artillery calculations and water balloons filled with bleach. Pretty easy to hit a stationary target with a pi handling trajectory calculations. Paintballs might be another option, bright pink.