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Here's a letter I just sent to ephotodiscounters.com, reprinted for your amusement. I did not P.S. this xkcd, but now wish that I had.

Howdy,

I just received a green screen and lighting kit that I purchased from your store via eBay. First of all, it seems great so far, so thanks for your prompt shipment!

I have a suggestion, however. I see some potential danger in the spring-loaded telescoping rods that make up the frame's side-stands. When I first unpacked one of these, I took it to be an ordinary telescoping rod. So I was quite surprised when I flipped down one of its fastening levers, and suddenly the inner rod - tipped with a thin metal screw - shot upwards rather dramatically.

Because I was standing to one side of the device, I simply jumped a little, and then laughed about it. But then I thought: oh boy, with a clumsier person, this could be a lawsuit waiting to happen. And so, to you, I might advise including a note or sticker with this frame that mentions these springs, and advises caution when loosening the levers.

That is all. Thanks!