Entries into groundwork

How many ways can you guys think of that you might end up on the ground during a fight?  For instance,

• the other guy might throw you or take you down or knock you down


• you might just slip/trip and fall


• you might be overwhelmed and do a sacrifice


• you might throw uke and he pulls you down


• you might duck or kneel during an evasion or during the execution of a technique

Educate me, guys.  There have to be other ways...