Physicists estimate that 47% of the energy in the universe is stored in stars, and the other 98% rages inside human children. Release your child's unyielding cosmic energy with today's Groupon: for $10, you get a $20 gift card toward bouncing, gaming, and obstacle courses at Jumpin' Joey's on Campbell Ave. Parents and children younger than 2 years are admitted for free.

Jumpin' Joey's softens landings for boisterous bouncers with more than 8,000 square feet of inflatable, Australian-themed physical fun. Kids can leapfrog through several bounce houses, including Pirate Cove, a swashbuckling variation on traditional bouncing domiciles. Tenderfoot warriors can also battle through obstacle courses or show their virtual prowess on video and arcade games. Open-bounce sessions cost $5–$8 per child, depending on day and time, and are ideal for corralling bounding-child brigades into one central location. Lifeguards patrol the gravity-challenged grounds, equipped with whistles and safety certifications from Safe Inflatables Operator Training Organization. As an additional safety precaution, aspiring ascenders are given a hand-stamp upon entry, ensuring all joeys go home in the pouch of the parent they came in with.