Is that a small BB laying there? That could have done it.. HOWEVER if its not YES THEy do explode from the inside. Mine did yesterday. Take a side view picture to prove it to Toyota. Also there are 100s of lawsuits about this topic.. Search Online
FYI , MINE shattered yesterday.. I talked to Toyota and they are trying to get it resolved. Take a side picture. IF it exploded from the inside the glass will be pushed out. mine was. there are MANY lawsuits going on now about this..UPDATE Toyota will warrantee it. BUT u mite have to fight for...