Not exactly a discharge, but it was bank-related:
When I was in college in upstate NY, I had a few roommates that were 'into' guns, and there was a fairly varied collection in our off-campus apartment. Well, one day, one of my roommates asks if I want to go shooting that afternoon. I say "Sure, but I have class." So, he says, "Fine. I need to buy ammo and drop off my girlfriend's car. Go to class and pick me up at my girlfriend's after class". Well, I go to his GF's after class, and wait, and he doesn't show. I call our appartment, and he's not there (this was before cell phones were common). I wait a little while, and then go back to our appartment, which was right on main street in a small college town, to see if he was there, which he wasn't.
2 hours later, he comes storming in. When I ask where he's been, he responds "In JAIL!". "For what?!??!", I ask. Well, it turns out that my roommate put his .357 in a shoulder holster under his denim jacket and went to the ATM at the bank 3 doors down (smack in the middle of town, at ~2pm)to get cash to go buy ammo. When he came out of the bank, the cops had Main Street shut down, and a crowd was forming. He walked over and joined the crowd, and asked what was going on. Someone in the crowd told him someone was robbing the bank, so he thought "Cool. I'll watch too.". The cops storm the bank, and a minute later come out scratching thier heads. One of them sees him standing in the crowd, and since he matches the decription of the guy someone called in as walking into the bank with a gun, they proceed to tackle him and drag him down to HQ, about a block away. I didn't know it at the time, but within the hour they had announced his name on the town radio station and campus radio stations as having been arrested for robbing the bank!
There was a big to-do w/ the the NRA and some of the state reps, but in the end, all charges were dropped. (He was a few years older than the rest of us, and had had a CCW since he used to work as a security guard, but had lost it and had just had it replaced with a standard pistol permit during spring break. A few days after the incident, he found his original CCW in his GF's couch.) He did, however, have to go back long after graduation to get his
.357 back...