Those tables were great just for reading. I remember some quite cleary:
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I think one has also an added effect that has all watchers being unable to do anything for a few rounds because they are laughing their butts off after witnessing a particularly embarrassing performance by one attacker.
Worst move ever, All opponents out (some number) rounds laughing, pulled groin (some penalty until muscle repair done).
Yeah, my warrior did that fumble. Though it was so embarrassing and painful for him, the foes laughing at him was enough of an edge to let the party win the combat. We also had a healer in the group, so 10 minutes later he was walking normal again.
Ever notice that on the crits (except for the special tables for the really big opponents), the higher the result, the more deadly it is, EXCEPT for results of 66, which tend to be instant kills.
Had another situation where the group still pulled through and won despite things going wrong. One of our semi-casters got nailed with something that destroyed his heart and did a massive amount of bleeding per round. This would normally be an instant kill because of the heart being trashed, but when he was created he'd actually rolled up that he had a second heart!
This was trouble for him, but he was still active. He was able to surprise the enemy because of this and we won the battle, and healed him before he ran out of hits. Of course an organ repair later, and he was good to go. Again, don't underestimate the value of having someone that can heal the rough stuff around, especially in Rolemaster.
The most extreme thing that I ever saw happen in RM though was when one of our groups was below level 10, and we encountered a guy (don't remember if he was human or elven or what) that went to attack us. We had no idea who he was, but our short guy (dwarf or some other short race) actually won initiative and threw his boomerang at him. Got an unbelievable result due to open ending. Then when it went to the crits, he also open ended multiple times. This was rather odd, but our GM used the Super Large crits for some reason. Got an instant kill, and his boomerang broke. (Don't know if that was in the crit or just the GM getting a bit of petty revenge or dramatic emphasis.) He cussed a bit, and then he started with the calculator. He then gave us each an insane amount of xp. We were floored.
Then he explained it and showed up. We had just killed one of the Dragon Lords ! So much lower level characters, first time encountering a dragon (much less a dragon lord), etc. It was flat out crazy!
Apparently we weren't supposed to be able to kill him (duh), as he was so much more powerful than we could imagine, but he was statted as an encounter, not as an event, so the GM went with the rules and adventure as written.
As a side note, that particular character retired, built himself an inn, and had the pieces of the boomerang mounted for everyone to see.
There are a lot more stories about playing and running RM, but those were some of the crazier things that came up.