I'm going to wink whenever a person winks on tv
Why would you wink along?
I want to just play a prank on them.
It's good to get engaged in the media you consume, but others in the room might think it's strange since people on TV can't respond to you. Try to find a person to play along with you instead. Otherwise you're just wasting your time.
You just have no idea how to have some fun.
That may be so, but I think it would be more fun for you to find a game that you can play with a person.  The TV will not be able to respond to you, so this prank might get boring pretty quickly.