Something that's farcical is ridiculously funny — absurd, even. When you stumbled onstage, tripping over your costume and pulling down the backdrop, you brought a farcical element to the serious play.
If it resembles a farce — a silly comedy that pokes fun at something — you can describe it as farcical, which is pronounced "FAR-cih-kul." Farcical comes from the Latin farcire, "to stuff," which influenced the French farce, a "comic interlude in a mystery play." It's thought that farce came to have this meaning because it was "stuffed" in between acts.