A zen buddhist walks up to a hot dog vendor in the park and says, "Make me one with everything."

The hot dog vendor makes him a hot dog with everything on it and hands it to him, saying, "That will be $5."

The zen buddhist hands him $20 and waits patiently. After nothing happens, he says, "Where is my change?"

The hot dog vendor says, "Change is within," and he slowly walks away.