At this hour? You must be kidding!

现在这个时间吗？你一定在开玩笑！

You must be kidding. It's too dangerous.

你一定在说笑。那太危险了。

You must be kidding? Dry bread and corn? How can you eat such things?

你一定是在开玩笑吧！烤面包和玉米？你怎么能吃这样的东西?

You must be kidding. I couldn't have clapped any harder. My hands are still hurting.

你一定是在开玩笑。我鼓掌再用力也不为过。我的手还疼。

Walk to the park? You must be kidding! It takes only five minutes to drive there.

步行去公园？你肯定是在开玩笑！开车去那儿只要5分钟。