(I work at a video store. A customer is on the far side of the store and yells out to me. He does not hold up the DVD.)

Customer: “Hey man, which Saw is this?”

Me: “Well, what does it say on the cover?”

Customer: “It doesn’t say anything!”

(I walk over to the customer and immediately recognise the problem.)

Me: “That would be Saw 4, sir. ‘IV’ means four.”