Sometimes its the little things that make all the difference.

Another example might be this Iranian soccer match below from here

Sepahan midfielder Adel Kolahkaj picked up a small, black object and tossed it away from the pitch. Turns out that object was some kind of mini grenade or firecracker, which exploded upon landing, causing the referee and his assistant to run for their lives.No one was hurt in the incident, and the game was cancelled initially but players came back on field after security inspection was made.The police officials are still investigating this matter.