It's a natural bodily function and sometimes it occurs at inoppertune times, like when you're watching television with your spouse/child/parents/friend/parole officer. The only thing worse than letting one rip and having to apologize is sitting next to someone else who lets one rip and doesn't apologize.
If you're living with a regular stealth-farter, you might want to consider this fart-operated TV remote that changes the channel every time someone farts.. It's the brainchild of Instructables user, Schmidtn, who has a dad who loves to channel surf and toot-toot. Schmidtn says he came up with the idea after reading about two other weird mods:
Now all we need is one that turns up the sound anytime someone asks, "Now, which one is he?" during movies.