Two recent occurrences come to mind, AS350B2-
First, After a "dog and pony show" at an elementary school, clear ground all around- High speed (125 knots, yes I know...) low level pass- 300' AGL- and attempt climbing turn to the left- No left cyclic, it feels like I hit a control stop left of cyclic center- released pressure, and cyclic normal. (NO MORE HOTDOGGING, EVER) I'm very glad I wasn't NOE.
Second, max NG cruise at 2000 ft, DA approx 4000, vulture spirals up approx 200 feet dead on nose, attempted to roll right, not "agressive"- no right cyclic- a little aft cyclic and a lesser movement right. In 13 years on the airframe, that's the only "normal" control input I've ever done that was limited by hydraulics, and I couldn't repeat it.