One of main tenets of The Zombie Survival Guide by Max Brooks (or as Widge calls it, The Bible) is to be aware and alert to your surroundings. Quoting from the book:
Sage advice. Not only will it keep you from becoming zombie chow, it can also get you free shit.
I happened to be watching Shootout, an AMC interview show. It was recording at Comic-Con and they had on Simon Pegg and Edgar Wright. Now watch this clip and see if you catch it: