Haha it’s a great party trick and works far more often than not. Another is think of an odd number between 1 and 50. People statistically hit on 37 for some reason. And an even number between 50 and 100? There’s one for that too, which is 68. You can get people three times in a row with that and they’ll have absolutely no idea how you did it, though there’s always a chance they’ll go with something else