I could use one of these right now....

This is kinda cool and gross at the same time. The lung flute uses a reed that when you blow into it, the reed vibrates. As weird as this is to comprehend, the vibrations work their way back into your lungs and shake up any mucus or phlegm until it rips apart and becomes easy to cough up. The video doesn't actually show the guy coughing stuff up, but you can tell he's ready to do so.

This is supposed to be useful for people with the flu, asthma or cystic fibrosis.