My friend at Ibis beat with a steel hammer on an out of inventory Mojo frame. He beat on what he knew to be the thinnest, least supported part of the frame (he knows this cuz he helped design the molds). He was unable to do more than chip the surface clear coat.
Later, on a different frame, he (220 lbs.) clamped a frame to a BB jig over an alignment table so that the frame sat horizontally at about 8" over the table top. Then he stood on the frame and stood incrementally further and further from the point of attachment. He ended up standing on the head tube and bouncing on it. It flexed but sprung back and showed no fatigue over several bounces.
I now respect carbon.