Last time I went through DEN, the guy behind me got turned around as a 2P. It went something like this:

Securitron3000 - I'm sorry sir, you've got to go to that line over there.
Mr. 2P - I am Premier.
S - Yes, you have to use that line over there.
M - Even as Premier?
S - You have to be Premier Exec or First (etc..)
M - But Premier can't?
S - Look, it has to look like this: <holds up my boarding pass> "Mr Ego.. Premier Executive 100k, UNITED First"
M - ... [walks away]...