No good hawk stories, but back in the late 80's I was prone to carrying around my first sailplane, a beat-up 1.8M 2ch ARF bought at Hobby Shack, in the back of my car, so I could play "can I actually slope it there?" Didn't always work out, but found some rather interesting flying spots that way :-)
On this particular day, I had to drive near downtown Huntington Beach, and return via PCH and Goldenwest. There was a perfect on-shore blowing, and it made me recall there is a 20'-25' bluff overlooking the beach at that corner. So, I flipped a U-turn, pulled over, strapped the wings on, got my nerves together, and chucked it off the cliff.
Made one pass and thought to myself, "the lift ain't great, but it's flyable! Yes!!!"
Preoccupied with my elated success and zoned in on the plane, I turned back around to make another pass... and... holy crap! More seagulls than I could count were right there, heading straight towards my plane, almost on top of me, and the plane heading straight towards them! I knew this wasn't going to end well.
Instantly reacting, I flipped her around in the tightest turn I could manage, ending up maybe 10-15' in-front of the lead birds, narrowly avoiding a head-on collision.
Calm down a little. Try to fly clean.
At the end of the bluff, I turned WAY out from the cliff, hoping I could keep it in the air long enough to get around the 300 or so obstacles presented by the flock as they flew by me.
To my utter shock, rather than keep going, the lead bird turned-in right behind me! And, the rest of the flock followed, one after the other, until the whole lot of them were flying in formation, with me setting the pace.
We kept this up for about 15 minutes, slope soaring the ridge back and forth, the gulls matching move for move and speed for speed, until I caught up with the tail-end stragglers and the lead bird got tired of the game... finally calling it quits.
I'd say that, and the day I kept my Oly II aloft for 7 hours straight and spec'ing out countless times (with only a forced landing for lunch), were about my most memorable RC experiences ever...