I've gotten a couple calls that there was nothing there at all. like someone's phone just turned on in their pocket.
one of the other calls was a no caller id and an asian lady asking to be transfered to the person that is responsible to my company's website. I told her like 5 times it was a personal cellphone until she said "sorry" and hungup.
since your name is Aaron, I'm surprised you don't get this more often. Accidentally calling the first person on my list of numbers is a hobby of my pockets.