"Wow! This is the best lemonade I ever had. Hit me again." -Kid[src]
The Ballpit Kid is a young boy with dark blond hair who has made numerous cameo appearances throughout the series. In contrast to Phineas and Ferb, he is an average boy.
Phineas and Ferb use their x-ray specs to find and retrieve him from the ballpit he has gotten lost in (hence his nickname). Oddly, when Ferb pulls him out, he has brown hair and is wearing a black shirt, brown shorts, and mahogany shoes and hat, similar to Buford Van Stomm's color scheme. But in the very next shot, he has his normal color scheme.
Sees Agent P, in the Lawrence robot, placing his "consumed" pies out from the robot's posterior ("Ewwww!"). He later sees Carl talking to Agent P after they bring Lawrence to the picnic. At the very end, he comes upon Perry again and says, "Hey, I've seen you somewhere!"