Ride down flights of stairs
Drift the back wheel in hairpin corners.
Slide both wheels on a berm.
Rolling stoppies on dirt.
Ascending 400 m on big gravel at 10%. Oh wait, I did that once on 22mm tires on carbon wheels on my TCR. Never again. I had to keep going all the way to the end (and the escape) because there was no way I could ride down. A long way out of the saddle over 10%. And people say Okinawa has no mountains
Over to you