Is it normal to collect trash and things people throw out?
Sometimes, I like to go through dumpsters and my neighbors' trash to see if they have anything I'd find interesting. Provided you don't bump into anything like racoons or stray cats (which would be cute, if they weren't so grungy), it can be pretty fun to see what people are throwing out and if it's something you can use, why not take it?
Last night's haul: half of a stale package of Oreo knockoffs, some more bottle caps for my collection, spare change (must have vacuumed under the couch and dumped without looking), and some jars.