Trading whistles with two of "somethings" in the woods, and two nights later trading knocks with one "something" while picking up my kid at summer camp (he couldn't handle the overnight part and i got called to pick him up late in the night). Beautiful summer night. Much strangeness. Did a google search "What whistles in the woods at night" and got lots of Native American legends of "the Whistling Woman", female bigfoots. Repeatedly returned to the same area over the next few weeks and had more strangeness - huffs and chuffs at dusk, shaken bushes and trees, gifts that disappeared overnight, and chest slaps in the dark ad we were escorted out. Then the activity petered out (they must have been there seasonally), and winter came and I was hooked.