Riddle Me This, Batman...

How do you get your wife to vacuum/sweep the floors every single day??  Install a sandbox in your backyard.  If you will recall my Dad made this little itsy bitsy (enter sarcasm here) sandbox for the boys as a joint birthday present.  I love you, Dad, but that's a lot of sand and it always makes its way into my darn house.  I guess it's a small price to pay for the hours upon hours upon hours of entertainment it provides for Thing 1 and Thing 2.