It was a day they said would never happen. We're not sure who 'they' were. TV executives probably. Or an animation artist who didn't want more colouring in to do.
Revealed over the weekend at the San Diego Comic-Con 2014, this five minute clip gives a flavour of what fans can expect from the hour-long Family Guy/Simpsons crossover episode, The Simpsons Guy.
With jokes drawing on Family Guy's plagiarism to the worn out comedy tropes of The Simpsons, the tongues of both franchises appear to be burrowed firmly in their collective cheeks.
Set to be aired on 28 September (in the US - we're yet to get a UK announcement), prepare for some NSFW comedy.