Things That Will Ruin an Otherwise Nice Run

I was having a nice run through Percy Warner Park today when I began thinking what can ruin a perfectly good run.   Most (if not all) are from personal experience.

• Inconsiderate Drivers
• Hangovers
• Not eating/drinking enough before running
• Eating/drinking too much before running
• Bad songs on your ipod
• Getting pooped on by bird/squirrel  (you know who you are, I WILL get you)
• Cramps
• IT band issues
• Knee/back/stomach/leg/foot/arm/pinkie/eyelid/head/toe pains
• Cold wind when you didn't wear enough clothes, especially in certain areas...my college friends and I called it FPS, or Frozen Penis Syndrome
• Prince's Fried Chicken, a Nashville tradition in what the call Hot Chicken.  I had some for the first time yesterday.  Big mistake.  Luckily there is a golf course pro shop halfway through my run.  Interestingly, my Garmin never lost satellite signal while I was in there.  Hmmm...
• Bicyclists
• Guys running with their shirts off when they have no business running with their shirt off
• Counting the miles until you are finished
• Rain/Lightning

That's all I can think of at the moment, but I'm sure there are more.  Feel free to comment anything that my ruin YOUR run.