Suprised he knew what a light bulb though. On the other hand a bloke went into a builders yard and asked the old guy 'Do you have 10 kg of sharp sand and 2 kg of cement, or would you prefer it in imperial?'
The old guy looked at him :' Put how you like mate. We do it by the shoveful'.
Though I did have one, well it looked vaguley human, get on the bus and present a travel card. I called him back and pointed out the card was invalid. He asked me why and I told him it was dated the 31 st. He rightly pointed out it wasn't the 31 st of the month. He was correct, except, his card was dated 31st of February.
The pillock was going through a pocket diary (Though I was suprised he even knew what a book was) looking for February the 31 st.