So it is said that this is a unique syndrome that borders on obsessive-compulsive disorder and attention deficit-hyperactivity disorder (ADHD). Patients suffer from obsessive thoughts, compulsive urge for certain body movement, especially making the barely audible "tic, tic, tic” sounds.
("tick, tick tick" I goes. Man, this is hard. "tiken, tiken tiken" Now that feels more natual. Only the man across the aisle is watching me now.

Then I read about a scientist had to give up high-energy physics because every time he saw a "Danger--High Voltage" sign, he can't help but felt compelled to touch the equipment.
And I can't help but diagnoses with mild Tourette's.

Not a big surprise since I already self-diagnosed with ADHD last month.

I need better reading material.