The latest episode of The Simpsons proved to be a real treat for Gravity Falls fans as Bill Cipher, the villainous interdimensional demon, cameos to offer some questionable advice.In the Season 33 episode "Bart's in Jail," Cipher appears during a mass hallucination experienced by The Simpsons. Within their hazy state, the family encounter Loki (not the Marvel Cinematic Universe version) who states that the triangular menace is one of his many forms. Voiced by Gravity Falls creator Alex Hirsch, Cipher yells, "Buy crypto, suckers!" The unexpected cameo surprised both fans of The Simpsons and Gravity Falls, who flocked to social media to discuss the crossover.Related: The Simpsons Fan Creates a Mini Working Version of the Family's TV Set

Bill's reference to cryptocurrency is believed to be a homage to the character's most iconic lines in Gravity Falls. "Remember: reality is an illusion. The universe is a hologram. Buy gold. Bye!" The chaotic, universe hopping monster is one of the show's more notable villains, tormenting protagonists Dipper and Mable Pines and Grunkle Stan.

Addressing the crossover on Twitter, Alex Hirsch wrote, "From age 8-18 I didn’t miss a single Simpsons premiere. I read the guide until the pages fell out, memorized every line, knew the writer of each ep & could tell you the season by the size of the characters pupils. I’m in total disbelief that tonight I just did a cameo on the show." Hirsch continued on to say, "If tonight I get hit by 3 busses then lightning then fall out of a window into a truckload of mousetraps I’ll die happy. Thank you @TheSimpsons for inspiring me to get into animation in the first place & for this surreal honor."

Related: Gravity Falls Creator Reveals How the Fans Changed Season 2

Despite ending in 2016, Gravity Falls has maintained a dedicated fanbase. The animated show follows Dipper and Mable Pines as they travel to the titular town to stay with their great-uncle ("Gruncle") Stan. During their time in Gravity Falls, they discover all sorts of bizarre phenomena and creatures, one of whom is the all-powerful Bill Cipher. A force of sheer chaos, Bill quickly became a fan-favorite character thanks to his iconic design and Alex Hirsch's impassioned voice acting.

As for The Simpsons, the animated family has graced our screens since 1989. Created by Matt Groening, Homer, Marge, Bart, Lisa and Maggie have become a mainstay of American television. The iconic show's 33rd season is currently airing on Fox.

Keep Reading: Gravity Falls Creator Really Wants to Expand the Mythology in a Video Game

Source: Twitter