 Complete the following phrase:  At the 2015 Monaco Grand Prix, Verstappen was involved in a high-speed collision with Romain Grosjean, after clipping the back of the Lotus on the approach to Sainte Devote and flew nose-first into the barriers at high speed. Verstappen was given a five-place grid penalty for causing the accident, and was branded dangerous by Williams driver Felipe Massa  although Verstappen hit back at Massa by pointing out he had himself been involved in a similar incident with Sergio Pérez at the 