他在台上表演魔术时出了个大丑，道具全都掉在了地上。

During his magic show, he made a ___pratfall when all the props fell to the ground.

演员在舞台上故意摔了个屁股墩，逗得观众哈哈大笑。

The actor's intentional ___pratfall on stage made the audience burst into laughter.