Why does it rain?

Ah, blue sky, sun is shining and it looks like the rainy days might be over. At least for a while. So I thought, why not go to the park before work? So I go and buy a coffee, and as soon as I reach the park, heavy dark clouds are hanging over me and the rest of the park. "Well, as long as it's not raining" I thought to myself and sat down in the grass. Everything was fine for about five minutes, then all of a sudden, a big load of water was dropped down on me. Great.

Now I'm home, and I am staying here until I have to leave for work (which is in about ten minutes). At least I managed to take some pictures before it started raining.