Wally!

[yankeecrazy9]

In the gag reel that rolls during the credits of the episode "The Big Picture," Bloo actually runs into Wally on the street. Bloo fawns all over Wally, then asks him for tips on pranks. Wally replies, "I don't really do that anymore. I hurt a lot of people back then." Bloo gets all disappointed. Then Wally tells him it was really nice meeting him, and shakes hands. Of course, Wally is wearing a buzzer, and shocks the holy heck out of Bloo, leaving him in a crumpled heap on the sidewalk. Wally laughs, says "Gotcha!" and takes off. All Bloo is able to mumble from the ground is "Hilarious." Then it cuts out. Wally does talk, his voice actually reminds me a lot of Goofy. You can watch the episode with the gag reel on the Cartoon Network/Foster's website.