You know, I should have caught that and realized that fouling was from that. Im kinda perplexed at how just the one plug ended up like that. The only thing that makes any sense would be detonation, but like Zef said, its not common at all.

I guess the only way to prove it one way or the other would be to use the bore scope and see if there are any chips in the piston. That sucker is just bent straight over, which seems odd too. Not chips, dings, dents, anything to suggest it was hit by debris.