How could you punish my head so thoroughly?

(inspired by MONDAY MONDAY by THE MOMAS AND THE PAPAS)

Rsday Rsday, so bad for me,
Rsday Rsday, I drank beer until I couldn't see
Oh Rsday eve'ning, Rsday evening I couldn't guarantee
That Friday morning would come without a trip to the Emergency.

Rsday Rsday, can't trust that day,
Rsday Rsday, sometimes it just turns out that way
Oh Rsday eve'ning, you gave me no warning of what was to be
Oh Rsday Rsday, how could you punish my head so thoroughly?

Every other day, every other day,
Every other day of the week is fine, yeah
But whenever Rsday comes, but whenever Rsday comes
You can find me "singin'" all of the time

K @ K's this Rsday?