Physical obstacles in magic?

Right now, I can't really do magic or cardistry because one of my fingers stings and hurts pretty much. I was at costco and ate a hot dog with lots of ketchup. When I returned to the car to play with my cards there was some "ketchup" on my fingers and went onto the cards. I cleaned it but then out of no where more "ketchup" arrived. I found out later that it was blood.

Have you guys experienced physical obstacles that can't let you do magic or cardistry for a certain period of time?
 
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