Tom: Was he part of the Wild Boys group that attacked you?
Joe: No, he was just some random guy in the crowd.
#2 That shirt is totally random.
#3 Correct usage. "The word "random" should not be used randomly, you douchebag. Of course, you're so stupid you don't even know the definition, so why do I even try?"
Used in conversation after someone says something that is a non sequitur or has no bearing on the conversation at hand, and is thus completely random.
"Frantone's was first built in 1967 by Antoine Frantonne. He changed the name in 1982 and started serving pizza."
- Clerks, the animated series