Omg!!!
I almost had to kill a friend of mine over this. Around Christmas, it was very busy in our salon and Mikey calls to sneak in for a quick haircut. Mind you, I am booked out at least three months, but he always manages to weasel in on a cancellation. This time, I was totally booked up but I agreed to stay late if he behaved himself and turned his cell phone off. (He's a regional manager of a big loan op, and is permanently attached to that damned phone). So, he comes in sans phone, but with this little contraption that guesses what you're thinking of in 20 questions. He insisted on me and everyone else in the shop testing it out.."Okay, think of something!"
It took about triple the time to get through his haircut that it normally takes.
( His wife told me that later on they were getting all settled in to go to sleep. She turns the light off and a few seconds later she hears "Okay, think of something!" She told him he didn't want to know what she was thinking of..)