Looks like a wine thief conspicuously in the middle of the crime scene. And a hydrometer jar, but no hydro in it, which means it was in play. In front a keezer, not a fermentation fridge. Which means you were testing the gravity of a carbonated beer for some reason. Or, you ferment in cornies in that fridge. Blast pattern seems to be on sides and front of keezer.
Probably you ferment in cornies (that little 3g) and forgot to open the pressure relief valve during fermentation, thus the great pressure when you went to check your beer. You took the cornie out of the fridge and put it on the floor there to make your job easier. You opened the bale on the cornie and it sploded. You dropped the wine thief and grabbed your camera like the superb HBT member that you are.
Or, same story but the cornie toppled from the top of the keezer due to unexpected activity from fruit bats that have inhabited your garage.