Strange question from my Australian boss

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Yesterday my boss sent an email to me said he wantted to go through the samples of the taps and shower mixers in our showroom. Then this morning I asked him what time was available for him. He just told me read his email of last week, seriously. This sounded like a thunder to me, big ? appeared in my head. So I said again that he just sent the email about this thing yesterday afternoon. He wasn't angry but still replied, read my email of last Friday. I had to walk back to my desk and checked the huge emails he sent to me last Friday. Then I found there was one email without any title and just had one sentence, which was "come to see me". Of course I doubted it but finally proved that email was correct, then I was confused. I don't understand why didn't he just tell me about that? Is this a joke? Even I have worked for him for 4 years I still don't understand this Australian people.