Hmmm, I don't know...it depends on the cross over I guess...
I personally can't stand it when people cross over LBT with some shows or movies what just make one go, "WTH??" :blink: Like LBT/Halo. Halo is an excessively violent video game where everyone is shooting everyone, so if someone crossed it with LBT, it would just be weird.
Maybe a crossover like Ice Age/LBT would be pretty fun because even though the characters aren't in the same time periods, one could make fun of that theory of the dinosaurs being frozen for many years and then suddenly come to life and Manny, Sid, and Deigo would look at the kids and go, :huh: and a good plot could start from there.
I say if the story is well written, well structured, and the cross-over sounds a bit realistic, or even if it isn't but how the crossover is made up is great, then I really don't see a problem with crossing over different fiction universes with each other
