NOTE:

Cans of compressed air do not use air, but instead use a compound known as sulfur hexafluoride. As sulfur hexafluoride is considerably heavier than air, it slows sound waves exiting from the throat, thus producing a lower pitch. Helium, in contrast, is lighter than air and therefore produces a higher pitch by allowing sound waves to move faster when exiting the throat.

Cans of compressed sulfur hexafluoride do not contain propellants as the rapid expansion of the gas leaving the chamber is sufficient to generate the necessary force. Sulfur hexafluoride is an inert, non-toxic compound that is safe to inhale in limited quantities, though people should be careful not to inhale too much as it could trigger dizziness, fainting or asphyxiation as it replaces air in the lungs and blood stream (just like helium).

After every inhalation of sulfur hexafluoride, be sure to take extensive deep breaths to ensure sufficient oxygen intake. Fainting in the pursuit of lulz makes you a dink.