(You) (just) watch!

Inf. Just pay attention to what I do, and you will see that what I said is true! Rachel: I'll get her to change! You just watch! Andy: Good luck! Andy: You watch! You'll see I'm right. Sally: Sure, you are. Bob: Watch! This is the way it's done. Bill: You don't know what you're doing. Bob: Just watch!
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Plus, as an added bonus, customers can enter the World of Watches TV sweepstakes to win a watch