Countless times trying to get out of a tight spot in the boonies, back it up as far as you can go, get some airspeed whilst still in ground effect and then zoom climb it out at best angle. Many of those you'd never get out vertically, you just run out of puff before finding clear air above the trees.
seen this technique advocated by the Aussie mil but it leaves you very poorly placed in the event of an engine failure since you are travelling too fast to stop before you rotate and have nowhere to go once you have rotated