Back in the 2e Days I had a bounty hunter I'd converted from 1e. A friend of mine had a character that hated my character with a passion. But, my guy being neutral and always willing to make a buck, found out there was a bounty on his character.
The next session, I introduced another character. Eyepatch, one arm missing and fitted with a blade, red hair, beard, etc. The DM even had my friend's character do a perception check at random times to notice anything "odd" about my new character, but he never made the check successfully.
We adventured together for 6 or 7 sessions, and my character convinced his to make a raid on a local warlord's treasury (the same warlord offering the bounty). Under cover of darkness, we flew in on a flying carpet, landed in the courtyard, and my character surprised his and using the old 1e pummeling rules, knocked him out. He woke in the warlord's dungeon, with my character sitting on the other side of the bars.
While sitting there, my character removed the eye patch, the false stump-blade, and told him, "Ok. Here's the deal. You've been going around threatening to kill me for a long time. But remember; I put you IN this cell, and I can get you out. I'll even split your bounty with you. But from now on, just remember that Logan the Hunter is no one to ever trifle with."
The PLAYER was so angry at being duped he stopped gaming for a couple of months.