It was a sure-fire way to determine your future when you were in middle school! Will you live in a mansion, apartment, shack, or house? Who will you marry? What career will you have?
You picked your choices (or maybe your friend picked them for you), then they drew a spiral until you told them to stop. The number of lines in your spiral was the number you used to count through the options - if your number was six, you counted to the sixth item and crossed it out. Then you counted to six again, and again, and again, etc. The remaining items foretold your future!
There are a few new online versions of MASH available for this generation of little techies, but I will always fondly remember killing time in class with this old school version.
You can check out a few fancy-ass online versions here: