Do you remember the movie LIAR LIAR? In it, Jim Carrey gets himself into a lot of trouble when he's suddenly compelled to tell the truth about every single little thing.
Think of your characters and any secrets they may be keeping or even just things they're choosing not to say out loud. What kind of havoc could you create in their lives today by letting something slip? Maybe a female character thinks her best friend should really start exercising. Or maybe a man who is gifted with computers feels the need to let it out how brainless he thinks many of the people in his life are.
See what you can reveal today that your characters don't really want to reveal.