trichobezoars, occur when ingested fur builds up in a cat's stomach after grooming. Most of the time cats are able to pass the fur through their intestinal tract without any problems. However, some cats are not able to pass them on their own and often vomit them up. You can help solve this problem, by brushing your cat frequently, especially if they have medium to long fur.
To add a little fun to this pet holiday, the Furminator Company is inviting everyone to brush their cat, make a mustache with the removed fur and take a picture of your feline wearing the mustache, then post it on the furminator facebook:
For more information on hairballs and how to tell if your cat has them, check out this website: