You mean he's genius? My foot! 你说他是天才? 笑死我了! Her story just doesn't add up. 她的说词站不住脚.
You almost convinced me. 我差点儿被你说服了. In a pig's eye! 连个门儿都没有!
That's a bunch of crap! 那是一派胡言! That's rubbish! 那是废话!
Yeah, right! 啊, 当然是如此了!
What have you been drinking? 你到底吃错什么药了? Aren't you stretching it a bit 你未免太夸张了吧?