This is a common question with canned foods. While it is possible for a can to explode if microwaved, it is unlikely. Cans are made of metal, which conducts heat very well. This means that the inside of the can will heat up faster than the outside. If there is liquid inside the can, it will also start to boil. The build-up of steam inside the can could cause it to explode. However, this is unlikely to happen unless the can is sealed tightly or there is no venting hole in the top. If you are concerned about exploding cans, open them before microwaving and place them on a plate or in a bowl.