Robot Bull

They were bulls made by Phineas and Ferb for the robot rodeo that they made because Isabella needed a Rodeo Clown Patch, when Phineas and Ferb were having the rodeo Heinz turned his fog machine on, fogging up Danville and turning it into a rodeo with fog, the problems start when Buford says that a red-balloon is making the bulls angry, when a kid let it go, the bulls knock off the riders and go after the balloon, taking the rodeo at they go after it.