Locked In - Your own crosshair, live in-game. This is what it was made for.
If it does not unlock try a different game
"I couldn't make it work with TF2. I used L4D2 next, played a bit, nothing either. I then quit the game, but not Crosshair X, and it popped a few minutes after. Seems a bit random." - Camper-Hunter
"I got it when exporting a crosshair as PNG, then cancelling the action in file explorer" - AFAK
Who Did That? - You found the secret fart sounds. We're not sorry. You're welcome.
Go to "Randomizer" and keep clicking on the small icon (randomizer spin counter) on the left of "Disable sound effects". If nothing is there, use the randomizer a few times first.
Certified Legend - 500 downloads! Your crosshair just earned you legend status. Well deserved.
The quickest way is to be added as a contributor to a workshop item that already has 500 subscribers.
EDIT: My item is missing 371 subs to hit 500 :(
Deck Unsupported