Pulling a Darwin
Not to be confused with the scientific theory of a branching pattern of evolution; pulling a Darwin actually pertains to a particular style of professionalism.

Pulling a Darwin is when one abandons his/her social and career obligations in order to fully commit to a spontaneous act of singing.
Person 1: So what's going on with you today man?
Person 2: TROLOLOLOLOOOO
Person 1: Ugh guess someone is pulling a Darwin today