Sometimes you are driving and you look over at the light and some dude has his finger shoved up his nose. Other times you are at a sporting event and a gentlemen next to you hawks a huge spit glob down at his feet. It's nasty. What's the grossest one, though? Inquiring minds want to know. Add your own personal gross-out if it's not here, and vote on the ones you think are vomit-worthy. What are some gross bad habits? Take a look at this list of bad habits!