Wheels on ground, flaps retracted, throttle straight forward, only to completely lose the engine.
Once we'd coasted to a halt it fired straightaway so not icing, he concluded it was a full rich cut, the first he'd seen in 30 years. We were around 3/4 full tanks and the rest of the lesson was fine
Ever since I've been a bit gentle on advancing to full throttle
In my (very limited) experience with (Lycoming) Cessnas and their acceleration pumps, you can make it stumble, but once the extra fuel goes through the engine, it'll roar back to life. I find it a little odd, regardless of engine maker, that it came to a complete stop due to accelerator pump over-rich.
On the other hand, carb ice melts remarkably quickly in a hot cowl with the engine stopped. Especially with Continentals with the carb attached to the sump.
But I have almost no time and I am probably wrong.