confused
 

so last night i was driving my 1996 camry wagon. 4cyl, and right as i was pulling in to the driveway my car put a golf ball sized hole right under the oil filter right on where the engine mount meets the block. what happened? this car has 190xxx and has enought oil, coolant, ect. it ran amazing and all of a sudden it decided to have a new hole. can someone please tell me what might have happened? i wasent even driving the car hard(it is a wagon) lol Please im so confused.