I always take my flash drive to school. I actually almost lost it twice. First time, I left it on a computer in the Student Center (busiest building on campus!) for the 1.5 hours I was in class. A guy was on the computer I had used, but it was right there. I guess it helped that the CPU is behind the monitor and you can't really notice it sticking straight out of the USB port. The second time, I left it at my night class which is held in a computer room. The door to the room had been automatically locking at 6 p.m. for weeks (those who were late to class had to knock), but they changed it before I left my flash drive there, so the door was unlocked. Good thing too - It was past 10 p.m. and I didn't want to deal with going to campus security and whatnot. It wasn't in the USB port, but I found it behind the teacher's podium. SO RELIEVED. I also almost lost my Nook too. I was charging it in my classroom (a night class) and I actually remembered the next day. I walked in a class (the students were in groups so I wasn't disturbing them) and the prof. there said, "I'm glad you found it." PHEW.
Anyway, I'm usually really lucky with important things I lose haha. I lost my flash drive like 3 times before that. (Once, I scoured an entire grassy field knowing it fell out of my pocket - good thing it was shiny too, because I saw the glare).
Yeah, I'm worried I won't be so lucky the next time haha