Being the petite person that I am, get thrilled seeing people who can reach books on a higher shelf without having to use the step-up ladder or bothering a library-attendant.
Spotted a guy who's towering above me, standing in the library check out line.
Me (Politely): " Am sure you get this a lot, but how tall are you, sir?"
Tall-Guy (Show off voice): "6 feet 7 inches!"
Me: "That's so cool- I am so short (point at my 2yr old in the stroller) He could be taller than me next year!"
Tall Guy (sincere voice): "Really?" (and gives my toddler a look of surprise)
Me (hurriedly): "Well, that was a joke!"
Tall Guy (sheepish voice): " Yeah.. I thought so.."