Breja: U.S.S. Serenity
Catchphrase: I didn't join Starfleet to [...]
Examples:
Panicked crewman: We are going to die!
Me: Stay calm. I didn't join Starfleet to die.
First Oficer: This seems very risky.
Me: I didn't join Starfleet to play it safe.
The Borg: You will be assimilated.
Me: I didn't join Starfleet to be assimilated.
Ship's Doctor: Captain, you need a vacation!
Me: I didn't join Starfleet to rest.
Science officer: It appears we have time travelled.
Me: I didn't join Starfleet to... no, wait, actually that's pretty much exactly what I joined for.
I see, you didn't join Starfleet to lose.