This story happened to me in the spring (most likely April or May) 2006 or 2007 (I'm terrible at dates) in my hometown Garwolin, Poland (60 km south from Warsaw). I had nearly forgotten all about this event because it wasn't a frightening experience at all. This story involves no monsters or unnatural beings, so there's no real need to assure you it's true.
At that time I was preparing for my Matura (the exam that ends high school in Poland) and I got into a fight with my mom about studying. I was quite emotional at that time, so the argument went badly, and eventually I ended up locked in my room crying. I have to note here that it's not normal for me to cry; I hadn't done it for years until that day and I haven't done it since then. It was just a childish emotional breakdown, but whatever the reason, it was intense for me.
Anyway, there I was sitting on the floor in the corner next to the cupboard, crying. The tears were dropping on the floor and I felt very bad. After a while, I noticed something was not right. The tears weren't dropping on my hands and knees anymore. I started to feel the cold drops on my head and places that weren't physically able to get wet by my tears. I got a little confused. How the hell was it raining inside the house?
I stood up quickly (maybe a little frightened) and saw the source of this "rain." It was the fern on the cupboard that was raining! The old fern that's been in my room since I can remember. It's been planted out a few times because it's withered often (we had never been giving it enough water), but it was still the same fern I grew up next to.
Now, I've heard sometimes plants get rid of extra water, but believe me, the soil was dry and as I observed, the water was coming out of leaves only on the side I was just sitting on. Momentarily, I forgot all about my worries and watched the plant curiously, but the water stopped dropping shortly after I stood up. I don't claim it was necessarily supernatural; not at all. But if it was, then I just know it came from the plant itself as I have no close friend or relative who died and would like to cheer me up or communicate in this curious way.
As I recalled this event a year ago, I started searching for some information about "feeling plants" and stumbled on Cleve Backster's experiments. In another source I found, it said that the fern is one of people's friendliest plants. I don't know about all that; maybe it was just a weird coincidence. All I know is that day my fern cheered me up -- on purpose or accidentally.