What do you guys think about crossovers? Do you get super excited at the idea of your favorite characters from different animes interacting with each other? Or does the idea repulse you?

An example would be One Piece. There's been a few episodes where they crossed over Toriko. For those of you who have watched those episodes did you enjoy them, or no?

I personally thought they were just fancy fillers, and thought they were mediocre at best.

Do you guys know of any other animes where there were crossovers?