OK, another Battletech one, because... well, because that's what I feel like posting.
So I had this long-running mercenary campaign. Whole thing was from scratch- they'd select one of four or five contracts that I'd write up, and each one had different employers, time of contract, type of missions, pay, bonuses, etc... and to my dismay, I totally biffed their salvage rules- they were pretty much treating the game like a shopping trip after a while, and by my own rules I'd hosed myself- soon they were running ridiculously tricked-out gear. And I was mad- mostly at myself, but it was easier to take it out on them.
So they took a job that involved finding a stolen short-range ballistic missile carrier (basically a Scud) that had been hidden in a shipyard somewhere. There were fourteen warehouses, and each one was on the map as a 3D paper building. And on the inside of each one was written what was in the building. The players had to stand a Mech next to a building for one full turn to scan it. It might be something random, like 'fruit' or 'lingerie' (hah!), might be the Scud, might be a booby trap, might even be an enemy unit- which could immediately open fire on the scanning unit at point blank range.
So, the defending units savaged one of the players Mechs (a Marauder, for those who know what I'm talking about), and it backed off a bit- but as the defenders got pushed back, they began using the Marauder as an inspector, avoiding combat and just checking buildings. I was gleeful- I was going to end that bastard's day. Because he walked right up to a building to inspect it, and I knew what building that was.
For those who know Battletech, they'll already be laughing- or cringing- when I say 'Demolisher II'. For those not familiar, imagine an old WWII heavy cruiser's gun turret, but put on treads. Two massive cannons, and a pair of machine guns to back them up. At this range, I need to roll a 4 or better on both cannons. It's bliss.
...and I missed with both. Even jammed the Ultra cannon. The MGs did pretty much nothing, and the Marauder blasted the tank into next week.
Now, that was NOT what I had in mind. I even had to walk away from the table for a while and calm down because I was so damned angry. I finally had a chance to punish the bastards, and failed miserably. Naturally, with my big surprise trashed without even going out with a whimper, the mercs won the day easily.
...and left me with a burning fire for revenge, which I administered several weeks later. But that post is for another time...