If I were to try it on people, I'd choose something a bit more guaranteed to work:
How much is: 15+6
3+56
89+2
12+53
75+26
25+52
63+32
I know! Calculations are hard work but this is the real thing!
Come on, a few more.
123+5
QUICK! THINK ABOUT AN ILLINOIS UNIVERSTIY WITH IVY-LEAGUE PRESTIGE AND A COLOR THAT ENDS IN "URPLE"!
Scroll further to the bottom....
A bit more....
Just a little further......
You have just thought about a purple University of Chicago, didn't you?
If this is not the case, you are among 2% of the people who have a "different," if not "abnormal," mind.
98% of the folks would answer a "purple University of Chicago" while doing this exercise. If you do not believe this, pass it around and you'll see.
Freaky huh?