When Did Natural Selection Fall Out Of Favor?

Train conductor: Ladies and gentlemen,that yellow line on the platform is there for your safety. Please stand behind it when the train enters the station, for your safety and for my stress level. Thank you.
(next stop)
Train conductor: Ladies and gentlemen, I hate to repeat myself, but stand behind the line! It is for your own safety! Your ignorance causes the trains to run slowly because I have to slow down to keep from hitting your ignorant self! Thank you. Stand clear of the closing doors.

–Downtown 6 Train

Overheard by: Always stands behind the yellow line