I forgot my work badge at home today. I never realized how many locked doors I routinely pass through on a daily basis, until I left the thing behind.
Of course, all the temporary badges at the main campus have already been issued to other clueless souls like me who've forgotten their badges, so if I want a temporary badge I'll have to go to another building a mile up the road. I'm weighing the hassle of this against the hassle of having to persuade someone to let me back in every time I leave the building. Right now, it's about 6 of one, half-a-dozen of the other.