Can you cry and laugh at the same time?
Can. This happens when something is wildly funny. You start laughing to such an extent that you think your heart is about to stop, you want to fall with laughter, and you start crying. You redden like a tomato yet.
Of course, you can laugh to the point. Sometimes you laugh to such an extent that you not only start crying, but your face hurts from laughter. Usually such attacks of "laughing" happen in a large company, when each word is an anecdote and the next word pulls the same anecdote.