A few of my own... Kyp Durron/Atris. One of them would have to time travel, and when they met, they'd hate each other at first sight. They're pretty much the two opposite camps of the Jedi, and that's not the sort of differences you can get over. Saba Seybante/Darth Maul. Likely to end in violence. Waru/Nen Yim. No. Just....no. So post your craziest ships here!