That doesn't make any sense!
太荒唐了！
Nonsense!
荒唐！
That's ridiculous!
太荒唐了！
Don't make me laugh!
太荒唐了！

想要打赌怎么说？
Do you want to bet(on that)?
你想打赌吗？
Let's bet on who's going to win this time.
我们打赌这次谁会赢。
How about playing for a pizza?
我们来赌比萨吧？
What are we going to play for?
我们赌什么？
Should we play for something?
我们赌什么？
What should we bet for?
我们赌什么？