Husband Beater?

I've heard a lot about husbands beating their wives through the newspapers and books that I read, but I haven't come across anything on wives abusing their husbands physically.

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Just now, my husband called me in the office at 3pm, asking if I hit him hard last night.

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"Huh?" came my puzzled reply.

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He explained that this morning, when he woke up, his back (from the shoulder blades downwards) hurt, as though someone hit him hard.

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I told him that our bed is sooo big (we had our bed custom-made), I didn't think I was near enough to hit him! In fact, I remember being so tired yesterday, I fell asleep and didn't wake up until morning.