I have heard of a case where the crew entered the figures in an A340 , back to front, V2 first the Vr and then V1. After take-off, the aircraft lifted then tried to climb out at supposedly (V2) V1 plus ten and proposed a steep pitch nose up shortly after airborne. Crew then decided to fly on basic climb out pitch angle of 12 degrees instead, and realised the mistake later. Mistakes happen and will continue. It's up to us to slow down, pay attention, cross check and know your aeroplane.