A direct quote from Mattias Adolfsson:
Do not sit in an ants nest — they think poorly about uninvited guests.
I've tinkered with the photo of the critter, as the original is just too awful to contemplate. I was the uninvited guest, technically, but in my mind the ants were the truly uninvited. Not very pleasant. But it's over now, thanks to steroids & antihistamines.