The opening story cracks me up...if you have to sit and wonder all the time what to write about maybe you need to find another passion. I have had several people who hear I am a writer and feel the need to tell me they are too but they haven't actually written a thing. Gotta love those people...wish all the competition was like that.
Always carry something to write on. I do carry notebooks and I have been known to text a note in my phone for story ideas or a character sketch. When I am forced to abandon my preferred hermit lifestyle and engage in social activity I always feel more comfortable sitting in a corner and watching the action around me with a pen in hand making up the story that is unfolding in front of me.