practical joke 恶作剧；捉弄人的把戏

【例句】
She glued her boss's cup and saucer together as a practical joke.
她搞恶作剧，把老板的茶杯和托碟粘在一起。

If this is a practical joke, you'll get it.
如果这是一个恶作剧，你等着瞧。