Got this from a random man at a bus stop and unfortunately missed my opportunity to use this. I was discretely eating a sweet potato falafel wrap from Leon, which is a popular UK healthy-eating "fast food" chain. It was lunchtime, and I was running around between meetings and if I didn't grab something then, I wouldn't have had lunch before about 3.30pm. I was standing away from the stop, lest anyone be offended by my eating on the run (some people seem to be offended by this, I personally don't mind as long as it's not particularly smelly and you're not making a mess, chewing with your mouth open, etc).
Random guy walks over to me and following exchange ensues:
RG: You're going to get fat if you eat that.
Me: (startled, not quite believing what I just heard) Um, this is the first thing I've eaten today, and it's perfectly healthy.
RG: Actually, it doesn't look too bad. Does it taste good?
Me: Yes, it's great. Thanks for your concern. (Steps away to the far side of the bus stop.)
I know I shouldn't have explained myself but seriously, who does that?