What's Up With The FARTING iPhone Apps?

For some reason, there has been a huge flow of FARTING apps in the iTunes App Store.  Check it out:

1. Fart Machine - Extreme Sound Effects
2. iFart - Fart Machine with Delay Timer
3. Fart Button
4. Fart Keyboard
5. FartBox (Position Detection)
6. Who Farted?
7. Pull My Finger
8. Touch My Finger
9. iFart Mobile
10. iPooted
11. WhoopieCushion
12. Mr. Poot!
13. iToot
14. Fartz
15. Excuse Me
16. iWhoopi
17. iFart
18. myFart
19. iPhart
    

And that's NOT counting the sound effects apps that include farting.  Plus, the vast majority of them cost $.99.  I wouldn't even download them for FREE.