Beer, meet frying pan.
Frying pan, meet beer.
Now let the games begin.
It's like beer Flubber.
Writhing endlessly.
Never satisfied.
Haunting your dreams.
The gunge could be due to the Leidenfrost effect.
View this video on YouTube
When a liquid is in near contact with something that is significantly hotter than its boiling point, the liquid produces a layer of insulating vapor that separates it from the hot object.