I heard a tale about an instructional sortie at VRD in a Robbie. Apparently upon entering auto the student bottomed the left pedal and the Robbie done some sort of a roll. They say there was oil on the under side of the blades.
I dare say there was sh*t on the seats as well.
Heard another one happened like that in NZ but it supposedly broke off the droop stops and on rundown the blades contacted the boom.
I was told of these in good faith that they really did happen so perhaps the Robbies don't nip the mast as readily as we believe.