What do you SWEAR you saw, but don't have any proof of?

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I saw a bunch of crows, around 20+, gather around in a circle. I was like wtf and took a closer look to see 3 other crows in the middle of the circle, all on their backs. And some crows from the circle would hop in and try to peck at the 3 crows, while they cawed and tried to defend themselves with their feet. I know crows are smart and all but didn't expect this level of social behavior. It went on for a while before a kid ran in and scattered them all.

As a child I touched some weird pest plant in our garden, I think it stung me. Then I saw everything in inverted colors for short time. And then back to normal. I was in such a shock, I couldn't explain it to my mom. I just went to her crying.

A man dressed as a confederate soldier walking down my street as I was heading home from work. There was a school bus coming and he stopped on the other side of the road, as if to let the bus pass before crossing, and I stopped at the stop sign. We looked at each other, the bus passed, and then he was gone.

I saw Tom Jones in a back street in Santiago, Chile, going in the back door if a club.

Once when I was a teenager I was watching a movie by myself. The tv room then had two chairs separated by a couch. I was on the chair to the right, and at one point I laughed really hard at the movie. I heard someone else laugh and saw what seemed to be a girl my age double over in laughter in the other chair. The weird thing is it didn't startle me; it just felt nice to share laughter. Then I realized that I was alone in the whole house and the chair was empty. So I turned off the tv and went outside

When I was about 7 or 8, I was at my grandmother's house in WV to spend the night, along with my brother and sister. It was Friday night and we were watching old school TGIF. There was a knock on the door and I jumped up to answer it (my grandma was in her bedroom and didn't hear it. I wasn't supposed to answer the door by myself, but I really liked to do it).
I opened the door and no one was there. I stepped out and looked to the left and right. To the right, beside the door, my grandma kept a small table. Sitting on that table was a Mandrill. One of those primates like Rafiki from the Lion King. I don't remember it moving, I just saw it sitting there staring at me.
I freaked out and slammed the door. My grandma came running out and I told her there was a monkey outside. She ran out my brother and sister ran to the door to see the monkey. I'll never forget when I ran out and that table was empty. My grandma told me I shouldn't tell tall tales and not to open the door when she wasn't around.

This happened when I was around 4. I was sitting on my grandparents' porch alone. There was a little piece of rubber sitting on the floor (imagine a rubber circle that had been cut in half). I was completely sure that I had seen it stand up and walk away. I started screaming and crying, completely inconsolable. I remember this so vividly but no one else was there to see it.