Now this would have been amazing to see Full House making a crossover with BMW in the 1990s. Mary Kate and Ashley and Morgan team up to annoy and get Cory and Shawn suspended from school?

Well, in a round about way, there kind of was a Full House-BMW crossover if you take into consideration Candace Cameron's (or Candace Cameron Bure, as I believe that she was officially using her married name for her acting career at this point) guest appearance (https://decider.com/2018/10/23/boy-meets-world-halloween-episode-candace-cameron-bure/) as a witch (https://femalevillains.fandom.com/wiki/Millie_(Boy_Meets_World)):
https://decider.com/wp-content/uploads/2018/10/boy-meets-world-candace-cameron-lawrence.jpg?quality=80&strip=all

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NO! I would NOT have liked to have seen a 'Full House' crossover since I consider the other show to be a more inane sitcom than BMW. As for Mrs. Bure's appearance on that episode? I consider those 'spooky' episodes and themes to have been the characters' pure dreams and imaginations rather than having been anything remotely part of the actual plotlines!

P.S. I wonder how Mrs. Bure was able to justify to herself playing an outright evil witch (even if one opts to consider it dream sequence/episode) -especially considering that she's been a vocal Christian from an early age.