Attendees of a party in the Westergasfabriek in Amsterdam were surprised by an uninvited guest on Sunday. A rat snake was found on the dance floor, Amsterdam's Dierenambulance said on Facebook.
"It is a mystery how the snake ended up there", the animal rescue organization said.
One of the the guests was fortunately not afraid of the animal, and picked up the snake and kept it warm while Dierenambulance responded.
The snake spent the night at Dierenambulance, after which is was transferred to the reptile shelter in Zwanenburg.