calwaterbear's answer doesn't sound like a joke at all, in my opinion. In addition, when you do telepathy tests, I think it is better to try to exercise tact and restraint, and to try not to offend people by an inappropriate insistence. I suspect this is a field where many people do not behave in a very rational way. This is another answer you will perhaps find interesting:
It was written by Loss Leader, who is a moderator on this forum.
Both answers (by calwaterbear and Loss Leader) were numerically correct.
It is perhaps also of interest to mention that Randi published in 1982 a book entitled: "Test Your ESP Potential: A Complete Kit With Instructions, Scorecards, and Apparatus." (see
link1,
link2). This may perhaps surprise some people, who view Randi more as a skeptic than a parapsychologist (of course). According to his
wikipedia article, he 'prefers to describe himself as an "investigator" '.