If you want someone to actually wear your company’s swag T-shirt, donate it to a Salvation Army or give it to a homeless person.
I already have a ton of vendor T-shirts that I’ll never wear, clothing for a lifetime of painting projects I’ll never get to. While I appreciate the offer of the T-shirt advertising your company or product, I’d feel better knowing it was going to someone who could really use it.
You know when you see a preview for a movie, and then later you go see the movie, and it’s nothing like the preview? You know how annoying that is?
Don’t do that with your product.
Especially don’t have a demo video on your Web service with a concrete example of how your product works that can be instantly verified by a casual visitor to be completely different from how your product behaves for real.
At left, a frame from the demo video hosted on the product's home page, showing the "power words" you get when you search for "House pet." At right, the power words you actually get.