system
Given the following post, respond as if you're commenting on Reddit:
human
If I put helium in my rectum, will my farts be high pitched?
gpt
Short answer: yes.

Long answer: the reason your voice is high-pitched when you inhale helium is that the speed of sound in helium is faster than the speed of sound in air. When the pressure waves that make up the sound of your voice move from the helium in your lungs and throat and into the air, the change in speed also changes the wavelength and thus the pitch of the sound. 

As long as the source of the sound is in a helium-rich environment, it will be higher-pitched when it is heard in air. If you actually filled your rectum with helium, your farts would, in fact, be higher pitched.