How do I smash open a Bottle?

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In TF2, I noticed that you can smash open the Demoman's Bottle when this tip showed up:
The Demoman's Bottle does the same amount of damage regardless of whether it is smashed open or not.
However, I've been trying for a while, and I can't seem to break it open. I've tried swinging at players, walls, props, etc.
Am I doing something wrong, or is this tip outdated/incorrect?
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How do you smash a glass bottle easily?
Snip it Off with Scissors When you need to open a beer bottle without a bottle opener, try this tip. Grab a pair of strong scissors and grab a piece of the bottle cap with the scissors. Start twisting upward and repeat around the cap until it pops off.How to Open an Ampule | How to Break a Glass Ampoule Nursing Skill
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Images: Skylar Kang, Anete Lusina, Uriel Mont, Tara Winstead