Had it happen once. Obviously got control back before I hit in my case. Wind shear from a thunder storm while towing a banner over the water @ 400'. Flying slow with all that drag on the tail, having a wing get stalled on you wasn't unusual in bumpy air. Happened all the time. Shot of power and pick the dropped wing up with your feet and it would generally get flying again quickly with little to no altitude loss. But in this case the wind shear stalled both wings, nose dropped hard and the ocean was coming at me fast. Full power wasn't getting it flying again. Definitely thought I was going in the water nose first. She started flying again about 150' or so, but being in a dive with the banner now above you means the nose doesn't come up as quickly. I was under 50' before I got it level and climbing again.
Nice thing is when it happens at 400' you really don't have time to get scared. A couple seconds of 'crap I'm gonna die' and then a few hours of 'well that sucked'.