Wunderpants
Appeared in
Uncollected: Every Story from Unreal, Unbelievable and Quirky Tails.
Story Summary
On the day of the big cross country race at school David is forced to wear the only clean underpants available, a pair of homemade pink ones with fairies. His embarrassment turns to wonder when he realizes the underpants are really wunderpants and give him super powers.