When someone sneezes, the most popular thing for someone in the United States to respond with is the phrase 'bless you' or 'god bless you'. There is one semi-popular alternative, gesundheit, which references health. While being more secular and thus more inclusive than the religious message that comes with a blessing, gesundheit is less often said. I have learned from following Penn Jillette's public persona that his family says the phrase 'that's funny' in place of 'bless you'. I do like that a bit and I am sure he would not care if I borrowed it as many of the other children in his kids preschool have according to his book , but that is Penn's thing, not mine. Sometime after realizing that there are no supernatural deities, only natural humans who like to think they are gods, I adjusted my habitual response to sneezing to gesundheit. It took me a little while to adjust, so I completely understand why some of my non-religious friends hold to