Rubber (2010)

A killer tire with psychokinetic powers causes people's heads to explode for no discernable reason.  I kept hoping the tire would launch itself onto a someone or into a crowd, but to no avail.

There is a group of onlookers watching the carnage with a tour guide, and some great dialogue by a Sheriff who explains that sometimes things happen for no reason.  The Sheriff provides some great examples of things that happen without reason in classic films.

I wanted to like this.  It had a clever beginning, but bogged down as it went along.  Great idea though.