Muslim (4:2127) - Muhammad struck his favorite wife, Aisha, in the chest one evening when she left the house without his permission.  Aisha narrates, "He struck me on the chest which caused me pain."

It was narrated that Muhammad bin Qais bin Makhramah bin Al-Muttalib said one day:

"...'A'isha said: Shall I not narrate to you from me and the Messenger of Allah (may peace be upon him)?" We said: "Yes." She said: "When it was my night while the Messenger of  Allah Messenger (may peace be upon him) was with me, he came in and took off his rida', took off his sandals and put them by his feet turned his side,  spread the edge of his waist  wrapper on his bed and lay down. He waited until he thought that I had gone to sleep. Then he slowly picked up his rida', slowly put on his sandals, opened the door slowly and went out, then he closed it slowly. I put my chemise over my head, and covered my head, and wrapped my waist wrapper around me, then I set out following him, until he reached al-Baqi' (the graveyard), where he stood for a long time, then he raised his hands three times. Then he set off, so I set off, then he hastened, so I hastened, then he jogged, so I jogged, then he ran so I ran, then I reached home before him and went in.

No sooner had I laid down but he came in and said: "What is the matter O Aish? Why are you out of breath?" I said "It is nothing." He said: "Either you tell me or the Subtle One, the All-Aware (God) will tell me." I said O Messenger of Allah, may my mother and father be sacrificed for you! (e.g. you are more beloved to me than my own parents [I would prefer to harm come to my parents before you])" And I told him. He said: "So you were the person that I saw in front of me?" I said: "Yes." He gave me a shove on the chest, then he said: "Did you think that Allah and His Messenger would be unjust to you?" I said: "Whatever the people conceal, Allah knows it; yes."

He said: "Jibril [Gabriel] came to me when you saw (me). He called me but he concealed it from you, and I answered him but I concealed it from you. He would not enter upon you when you were not fully dressed. I thought that you had gone to sleep and I did not want to wake you up, and I was afraid that you might be frightened." He (Gabriel said: "Your Lord is commanding you to go to the people of al-Baqi [the graveyard] and pray for forgiveness for them."

I said: "What shall I say them O Messenger of Allah?" He said: "Say: "As-salaamu 'ala ahlid-diyari min al-mu'mineen wal-muslimeen wa yarhamullahul-mustaqdimeen minna awl-mustakhireen, wa inna, in shaw Allahu bikum lalahiqoon. (Peace be upon the people of these abodes, believers and Muslims. May Allah have mercy on those of us who have gone on before and those who come later, and we will - if Allah wills - join you.)"

- Sahih Muslim, vol.2, Darussalam, Riyadh, 2007, pp. 505-6

Sure Gandalf, here are a few more. It's not like I am surprising you with these. I have posted them already in this thread, fairly recently. There are a few posts worth, due to the character limit. I have also reposted them several times, at your request. How long do you want to keep this up?

So Muhammed laughing when other men also beat his wives does not contribute to the pattern of behaviour you demand?

My very uneducated guess on this is that the joke is not the punishment, the joke is the request for money. Which makes sense given The Prophet is clearly laughing in the context of his wives *ALSO* asking for money.