Screwy tire

This morning I was (un) pleasantly surprised to discover that the tire pressure light on my dash was on and my car was driving funny.  So I stopped and put sir in the tire, went to work, and decided to see how things were after.  Sure enough, leaving work and driving across the street to the dojang (yes I work across the street from the dojang) the tire pressure light is on again, staring at me unblinkingly from the void.  So-more air so I can get home, had Mark follow behind just in case, and called AAA while I made dinner.  Samuel got to watch the guy change the tire, remarking "that's so cool!".  I forgot he doesn't see that a lot.  My dad was a mechanic and a machinist before retiring, so I saw him working on cars all the time.  I'm glad Samuel got a cool experience for tonight.  I just hope that screw we discovered in the tire doesn't cost me another new.tire.  I just replaced all of them this summer!