1. Obtain any weapon.
2. Move the weapon into the Hands slot.
3. Enter the crouch position.
4. Toggle the weapon into the readied position (default Space key).
5. Strafe right while holding the Shift Key to walk.
6. Press Space to lower the weapon while strafe-walking to the right.

This also occurs with forward-right and backwards-right movements (W+D, S+D).
This does not occur with any other directional movement.
This occurs with both melee weapons and firearms.
This does not occur with Fists as they cannot be readied while crouched.
This will also occur if walk mode is always on (Left Shift x2).