If you've ever seen Whose Line Is It Anyway? you will understand this premise immediately. If not, that's what the following explanation is for. And then you need to see the show. It's hysterical.
On the show Whose Line Is It Anyway?, four actors improvise scenes given to them by the host, Drew Carey. One of the segments they often do is called "Scenes from a Hat." Before the show, audience members are asked to write down a suggestion for the actors to perform. It can be anything, like "things a bad dentist would do" or "what your wife says before bedtime." Anything at all. All the suggestions are put in a hat, and Drew picks a few out for the actors to do.
What I do is put the names of characters in one bag, and random scenes in another bag, then pick one paper out from each bag. And then write about that character in that scene. I usually do this when I'm stuck with a story or I'm not feeling inspired to write anything. It's also a good way for me to write about characters I wouldn't normally pick. Then I throw away the scene. I keep the character, of course. Sometimes I get some really weird combinations, but I still try to write out the scene. It makes me more creative, I think.
Also, I'm always looking for suggestions for new scenes to put in the bag, or maybe some non-main characters to add to my character bag. Feel free to suggest away.