Have you ever hit that wall?

    Have you ever sat down to write and NOTHING??? You just can not get those creative juices flowing, or worst yet you get a great idea for story and life intrudes. Next thing you know the idea has disappeared and BAM you hit the wall. Oh what do you do?? I try writing prompt exercises. There are a few good books that contain writing exercises out there. They offer exercises such as : You are 12 years old and the circus is in town. Your parents will not let you go; so you ??
    These exercises can be fun and often get you to thinking of something other than the wall and next thing you know you have gotten around it.
    Another options of things to do is go over your notes (everyone keeps them right?) and do some free floating research online or at the library. Let's say you wrote a note about WWI veterans because you saw a article on the last surviving veteran passing away. You could research WWI and come up with many topics for stories. Just let yourself go.
    I also practice typing. My typing is horrible at about 10-15 words per minute. I have a program for my laptop so I occasionally practice typing. I have gotten slightly better and now use 2 hands instead of the  2 finger hunt and peek method.
    The important thing is I do something for the allotted time of writing to get the juices flowing or polish skills. Let me know what your methods of dealing with the wall are.