I am dying to figure out the name of a horror movie I saw on TV as a kid but am unable to, no matter how refined I make my google searches. I am 21 now and I estimate I was between 6 and 8 when I saw the movie, so it probably came out before 1994.

Here are the parts I remember:
A rock from outer space lands and gets shocked by electricity from power lines. A small (purple and liver-shaped I think) blob-like creature comes out and begins terrorizing a small town. I hardly remember any of the movie, but one scene I remember is the creature being in a jar on a family's countertop and making the jar slide off and shatter so it could break free. I also remember a man having swirly marks on his back after the creature attacked him. The only other scene I remember is a person chasing a softball (or maybe a baseball) under some trees where the creature was hanging out, but didn't get attacked at that moment.