Homer Simpson and Peter Griffin bond over doughnuts before clashing over beer in a preview of the hour-long mash up.\rbr\rbrFans of Family Guy and The Simpsons have been given a first glimpse of the moment the two animated families meet in an upcoming crossover episode.\rbr\rbrThe footage, which was shown for the first time at the Comic-Con convention in San Diego, also features talking baby Stewie showing Bart an extreme prank call.