My list:
Running with a water bottle belt.
Running with a backpack.
Running at night.
Running with hand-held water bottles.
Running with a really slow or overly talkative person.
Running without access to adequate fluids.
Running in non-running clothes.
Running when hungry or too soon after a meal.
Running with a dog (on a leash, as is generally required).
Running with a baby jogger.
Running on a treadmill.
Running in really horrible weather such as a downpour.
My Track Record 
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