This brings back fond memories of my years in the cube farm...
I once stumbled on a website for a company in Spain that sold little gag boxes which emitted some very realistic, but totally outrageous flatulence sounds. There were several different "programs" available, and the website provided samplers of music from each on line.
At work, I used to love to cursor one and turn off the monitor, crank up the volume on my speakers, then click the button just before I tookm an early or late lunch. I could visualize my co-workers prarie-dogging up and down out of their cubicles trying to figure out who the guilty party was.