Thought of the Day #154 - Stupid Stick

For some reason, during the past couple of years I've randomly made
completely stupid mistakes when figuring tips at restaurants. I
typically tip 20% unless service was poor. That's usually a really
simple mathematical task, but for some reason I make silly
mistakes...one time giving a 30 dollar tip rather than 3.50. I think
I'm suffering from simple distractions and lack of attention to detail,
but it could be that I've been permanently hit by the stupid stick.