Time and again in the sim...
Yes, all too often.
As part of training, have asked the PNF to 'call' V1 and Vr ten knots early.
The rather inexperienced guys nearly always start the rotation maneuver, irrespective of the correctly set bug on their ASI.
Lets face facts here.
IF the PF cannot actually look at his ASI, and determine for himself the correct speeds, they really don't belong on the flight deck.
Period.