The slightly different variety of this scenario that irritates me goes as follows
F3G arrives at check in (for multiple flights), hands over passport with eticket recipt in it
Agent hands back eticket receipt without looking at it and keeps passport
Agent then asks "where are you flying to?"
F3G replies politely with destination, but feels like saying "why didn't you read the ticket, dork?"
This must happen 3-4 times every month.