one falsely presuming that their own actions are far more cool/significant that they actually are, often deserving the song "Heroes" (originally performed by David Bowie and later by the Wallflowers) to be played/sung as a sarcastic theme song as they walk away.
Jack and Jill are sitting at a coffee shop enjoying polite conversation. A pop-collar-frat-boy-looking hero appears.
Jack: Can I help you?
Hero: (staring intently at Jill) I just wanted to say whazzzup and see how y'all were doing.
Jill: Go away, you're creeping me out.
Hero: Well I'll see you kids later then. (turns and walks away, obviously trying to strut as he does so)
Jill: (sarcastically singing) We could be heroes...
Jack: (following suit) ...for just one day.