Is anyone hearing loud booms that only you can hear?

For the past several months, I've been hearing loud booms, almost like a distant explosion but unlike the deep bass produced by mobile sound systems. Every time, not just once in a while, but every time I ask those around me "did you hear that". They look at me like I'm crazy. Weird thing is that I can "feel" the boom as well as hear it which makes me think I am going crazy or something. Anyone else?