I bought a TV-B-Gone a few years back. It’s been fun. I make a point of never turning off a TV that anyone is obviously watching and have only once had anyone turn a television back on. Most people find it easier to just talk to the person sitting across the table than to turn the TV back on.
The only problem is that I can never really tell in advance when I’ll need my TV-B-Gone and so frequently end somewhere wishing I had one when I’ve left it at home. What I really need is a TV-B-Gone-B-Here.