Scientists agree that the only reason adults have children is so they have a socially acceptable reason to visit amusement parks, eat at novelty pizza arcades, and see movies with Shreks in them. Put some fun in the oven with today's Groupon to Pump It Up in West Chester. Chose between the following options:

• For $20, you get six pop-in playtimes (a $42 value).
• For $25, you get a $50 party gift certificate.

Pump It Up cultivates all-weather smiles with its indoor, inflatable arenas for children. During six fun-filled pop-in visits, youngsters can leap around gargantuan air-filled bounce houses, skip down air-filled slides, and slither like snakes covered in bacon grease through an air-filled obstacle course. Pump It Up’s spacious facilities are climate controlled and maintained according to rigorous safety guidelines enforced by a well-trained staff and local police. Parents bounce for free during pop-in sessions, so childless adults who want to play will need to borrow a neighbor’s kid or win one by collecting soda tops.

For birthday celebrations or choreographed team bouncing, Pump It Up offers a party gift certificate valid toward any regularly priced Classic party package or slightly shorter Classic 90 event. During parties, child hoards can enjoy free rein of the facility before assembling in a private party room resplendent with cake, presents, and inflatable pizza.