What HOLY BLOOD WARS exist in your profession?

Heaven to me would be being sat at the following table:

“I’ve noticed your ‘cream sugar’ state is currently ‘0 0’. Would you like to change it?”

“Yes please, make it ‘1 1’”

To backream or not backream to ensure adequate hole cleaning.
It has died down a bit recently, but 10 years ago it was a hot topic in the drilling world.