i got a flat on the way to work this morning - 4 blocks from work and i heard a HISShissHISShiss that is the trademark sound of a full on tire puncture.
luckily the glass stayed in the tire, making clean up a lot easier. most flats you gotta search all over the tire, running you fingers along the inside, waiting for something to cut you so you can clean it out.
changing a tire when you've been putting in a full-on effort means you're going to sweat a ton - when you're moving on a bike, the air helps. standing on a corner, not so much.
at work i'd immediately get under the air vent in the server room and start toweling off. that's the trick. that, and stinking. anyway.
knock on wood. first flat in a while.