All three while night fishing:
Weirdest - Around 2am, I heard somebody walking up and down a trail next to the pond I was fishing, playing a flute or fife or some other kind of woodwind instrument.
Coolest - Owl dive-bombing a MS Slammer. Fortunately for both of us, it wasn't hooked.
Scariest - Dragged my kayak down a ways to a small pond. After a while, I heard some coyotes howling, carrying on, and circling the pond for over an hour. Took a while for me to work up the nerve to get off the water.