There are a lot of possibilities here. the problem is you would need some pre-work here but it would be a great opener.

I like this principle a lot and for the moeny you can't go wrong.
Easy to do and, as Luke states, there are other ways to perform it not just the one that is shown.
Nice one, Luke!

It is a neat idea and its a nice trick. I do not ever perform this because of what you need to do ahead of time to perform this, but for five dollars, it isn't a bad deal at all. Overall it is just OK

Although this method is nothing out of the ordinary, it allows for so many applications and -if performed correctly- gets great reactions from your audience. I guess you could say that this is a typical Luke Jermay effect!
Luke explains the method very well. He also mentions a few tweaks you could apply to it and informs you about the possible dangers of the effect.
What I find really great about "Think Stop", is that many times it puts a smile on peoples faces -be it the part where you apparently hear them say stop, or during the performance where you can throw in a couple of jokes.

Essentially this is a very easy method that requires only little preparation (which can be done in no time) and still blows peoples minds.