In what episode did Sheldon show his perfectionist characteristic

Perfectionist can be hard on themselves even on small things
( hitting themselves, make the body tired by doing extra work )

Perfectionists are often on the lookout for imperfections in themselves and others.

Perfectionist will be very proud and confident of him/herself.

( volunteer him/herself to be the leader )

Perfectionist was an official mental diagnosis

Dangers of being a perfectionist