Physicists estimate that 47 per cent of the energy in the universe is stored in stars, and the other 98 per cent rages inside human children. Release your child's unyielding cosmic energy with today's Groupon: for $60, you get $120 toward inflatables from Apollo Jump of Saskatoon.

Apollo Jump furnishes celebrations with a colourful array of buoyant, bounce-worthy inflatables. Like a catapult aimed at a mattress, the castle bouncer ($120/day) supplies endless high-soaring high jinx. Invite honoured guests to race down a towering 18-foot slide ($175/day), and miniature revellers conquer the Choo-Choo Jump N' Slide ($175/day). The Pedestal Joust can help resolve conflict between duelling lemonade stands and comes with Everlast headgear for optimal safety.

Apollo Jump delivers inflatable bounty to the party locale of your choice, where friendly staff will kindly set up the inflatable, make sure every component is in prime working order, then deflate it with a comically large safety pin after the event is over. Check here for answers to inflatable-related questions, such as the ideal air pressure of thought bubbles. Delivery is free in Saskatoon, with an additional delivery fee of $1 per kilometer outside of the city.