My prediction is that this is possibly an honest mistake when they are drunk. However, once RK realizes what happened, he isn't going to accept Madhu back. Instead he is going to say its revenge for the 5th thappad!
That could possibly be the last straw for Madhu and she could take revenge by entering the film industry (though I don't see that as revenge). And impending doom is for bacha track!
Sigh! I wish I would be proven wrong though