What makes the funny nois in farts?

The funny noise in farts is caused by the vibration of the anal sphincter muscle as the gas is expelled. The sphincter muscle is a circular muscle that surrounds the anus and controls the release of gas and stool. When gas is passed, the sphincter muscle relaxes and the gas is expelled through the anus. The vibration of the sphincter muscle against the gas creates the funny noise. The pitch of the noise depends on the tightness of the sphincter muscle and the amount of gas being expelled.

In addition to the sphincter muscle, the shape of the anal canal also contributes to the funny noise of farts. The anal canal is a curved, muscular tube that connects the rectum to the anus. The curve of the anal canal creates a resonance chamber that amplifies the sound of the gas passing through. This resonance chamber is what gives farts their characteristic "honk" or "toot" sound.

The combination of the sphincter muscle vibration and the resonance chamber of the anal canal creates the funny noise that is associated with farts.