They bore into your head. They won't let go. There's no known cure. Earworms can 
attack almost anyone at almost any time.
No, it's not an invasion of jungle insects. It's worse. Earworms are those songs, jingles, and tunes that get stuck inside your head. You're almost certain to know the feeling, according to marketing professor James J. Kellaris, PhD, of the University of Cincinnati.
What do you think do these qualify as illusions? There is no music, no song that anyone else can hear, but they persist in our heads sometimes for hours or days.
Nearly 98% of people have had songs stuck in their head, Kellaris reported at the recent meeting of the Society for Consumer Psychology. The 559 students -- at an average age of 23 -- had lots of trouble with the Chili's "Baby Back Ribs" Jingle and with the Baha Men song "Who Let the Dogs Out." But Kellaris found that most often, each person tends to be haunted by their own demon tunes. Read the rest on WebMD. Also check out Exploratorium, The Science of Music.
If you had too much time on your hands and you wanted to create an illusion what illusion would you create? Well if you were Kevin Kelm the Crown Prince of too Much Spare Time you might create the Robodump V1.0
RoboDump is a robot. Sort of. And it poops. Sort of. Forever. A horrible, never-ending bowel movement complete with straining grunts, horrific gas, splashes, and pee sounds.
The left channel speaker points up into the room (for the voice effects) and the right channel speaker points down into the toilet (for the business-end effects).
I snuck RoboDump into the men's room at the office. Unfortunately, today turned out to be the day of a board meeting. Whoops! It still went over well; the office was abuzz all morning with gossip about the guy in the bathroom. Several people theorized it was the CFO. The janitor commented to someone in the hallway that he wanted to clean the restroom but "this guy's been in there all morning."
I also decided to dress it in businessware to make coworkers less likely to try to talk to it... if it looks like a customer or visiting bigwig, they'll be less likely to offer help or ask for a courtesy flush.
If you want to listen audio portion of this illusion go to
his site.
