enough to make a cat laugh意为“让人笑掉大牙；极其可笑”。

【例句】
To see Tom trying bicycling is enough to make a cat laugh.
看到汤姆学骑自行车的样子，真叫人笑掉牙。

You should hear the upper-class accent she puts on for the benefit of customers. it's enough to make a cat laugh.
你该听到她对客户说话时所用的那种上流社会腔调，真是十分好笑。