well not kill at all but one time i make my owm play station control you know buttons and thumb joysticks.. and one wire broke and make a bypass (sorry i don´t know how to say when positive and negative touch together in english) what happend was a lot of current for the arduino regullator and heat so the protection open the circuitbut waiting for 5 hour the protection stay cool and arduino works again. its alive!!!!
And now when something doesn´t work i always thing may be is becouse i have broken the arduino the oder time.... but not normally doesn´t work becouse me.