One minute, things are fine.
The sun's out (sort of), the birds are chirpin', the gals are wrestlin'. Life is good.
Then all the sudden, it hits you all at once, like a brick or a can of peas. THE DOUBLE-BOUNCE.
Double-bouncing is literally living life on the Dangerous side with a capital D.
Or go to the hospital if it's bad enough.
Remember: Always be careful when engaging with this bouncy death trap.
