This was given to me by a friend today, who had visited a recent Mardi Gras parade. His girlfriend found it while randomly scavenging around.
It originally had a red rubber band on it, but that ended up cut and lost, hence the regular rubber band to keep it closed. Thankfully it was never used though.
Are you being intentionally obtuse? There's a big fucking difference between "someone must have dropped it" and "someone threw it at people".
If you found a pocket knife, would you be as offended?