Too much spice and the dish will be overwhelmed by it. Similarly, an occasional dash of sarcastic wit can spice up a chat and add an element of humor to it. But a big or steady serving of sarcasm will overwhelm the emotional flavor of any conversation and taste very bitter to its recipient.
Slapstick comedy is primarily a physical kind of comedy based around pratfalls and mild comic violence -- smacks in the head, pokes in the eyes, people falling down, etc. While it is often thought of as low comedy, some of the best at slapstick have made it into what some critics call 'high art.'.