I played in a Mercenaries, Spies, and Private Eyes game many, many moons ago. Just the GM, myself, and another player. We decided it would be a PI game, with the other player and I being partners in the two-man PI firm.
In MSPE, you rolled for starting money (something like 3d6 x $100). with the proviso that if all three dice are the same number, your character is independently wealthy and IIRC you get that roll x $1,000 per month. As luck would have it, I rolled three 4's, so I had $12,000 per month to play with.
The game also had some odd possibilities that could be rolled during character creation, and my character ended up being a British lord - nobody with any real influence, but rather unique as a PI. All my other rolls during character creation sucked, so my PI wasn't all that skillful. My partner, on the other hand, was a part-time journalist in addition to being a PI, and was very skilled.
Things were fun for a while, but then the GM decided to have my character recruited by MI-6 as an independent operative, but I wasn't allowed to reveal this to my partner. Sounded cool, and my first assignment was to go down to El Salvador and either destroy or redirect a weapons shipment bound for some rebel fighters. So I convinced my PI partner that we had been hired by a reclusive individual to head down south to investigate shipments being redirected from his company.
All went well, and we ended up blowing up the ship with all the guns, and were then picked up by a ship owned and operated by MI-6. As we're speeding away, the captain informs me that I have to kill my partner to keep him from reporting on this secret mission. I tried to convince the captain to take some of my money and offer it to my partner to buy his silence, but the captain insisted either I had to kill my partner, or one of the crew of the ship would do it.
I ask my partner to meet me on the ship's fantail after midnight to discuss something. My plan was for both of us to jump ship, thinking we'd swim back to shore, make our own way home, and I'd cut my ties with MI-6. However, the GM figured out what I was doing and decided to be a dick, having one of the crewmen shoot my partner before we could jump the railing.
There my character is, with crewmen pointing machine pistols at him. So I decided to pull a Blazing Saddles. I wrap my arm around my neck, point my pistol at my own head, and shout, "One move and the lord gets it!"
The GM was stunned, saying, "Whaaaaaat?!?!?" to which I said, "That should be the reaction of all the crewmen." The GM, still in full-on dick mode, says, "It is... for all but one. He aims his weapon at you and says, 'You're right. One move and he gets it.'"
So I said, "I pull the trigger."
The GM tried to talk me out of it, but I was adamant. My best friend and PI partner, who has had my back all along, is now dead because I brought him along on this stupid secret mission. The GM even had me make a to-hit roll and damage roll. And on 2d6 damage, I rolled two 1s. But it didn't really matter. It was the end of that game. The GM was pissed, but the other player thought it was awesome.