Nope, can't say I'm sure I have. Scariest moment of camping was in the middle of the night, I heard this really loud scream/screech. Almost sounded like a person screaming, but it was more like a screech, extremely loud, and just scary. Also, it sounded really raw, like someone just trying to make as much noise as they can. Might have been a person, but it was such a strange sound that at first thing I thought of were those unknown creatures, bigfoot, mothman, and what else. Stayed awake for an hour, just scared of each sound, grabbing on to my two knives, and lying there. If big foot does exist, I find it strange that there has never been anything concrete found. People have shot videos, found footprints. Wouldn't there be hair, or something there? It seems highly unlikely that no physical evidence has ever been found, but I suppose it's possible. I'm agnostic about bigfoot I guess.