In 'Arcanum: Of Steamworks and Magick Obscura' multiplayer I kicked off on the townsfolk, and ended up being chased around this pond. Now I'm not sure how the next thing happened, but I suddenly fell into the pond and the whole screen turned into the water tile as far as I could scroll in any direction. My character had disappeared. When I quit and reloaded, the same screen reappeared. My only guess is that my character was somewhere behind that water, and what I was seeing was the water layer of the terrain, underneath the main layer, which I'd somehow fallen through. Weird.
Not a glitch, but in the same multiplayer game my friend played a half-orc. After fighting on one of the islands, we returned and separated to shop. As I was shopping I heard the sound effect for magic being cast. I left the shop I'd been purchasing armour in only to see my friend's half-orc character run past and then seconds later all the townfolk chasing him. It was hilarious. He fled back to the island to escape them. When I joined him there, we worked out that during the battle his character had been scarred, dropping his charisma score below a human level. With the scarring he was now classed as a monster, hence the town attacking him. He had to wait in exile while I bought him a scroll to cure his disfigurement!