Full disclosure:

I have a compulsion to add text to photographs that I see on the Internet--or just about anywhere, for that matter. Sometimes I'll make a composite photo to further a narrative, but, often, the photo simply speaks to me and it's clear what the caption should be. Frequently, this hits me right away and I have to stop everything I'm doing to create a meme. I generally do this for my own amusement, but I also have added captions to family and friends' photos for use as holiday greetings, birthday cards, get well, and thank you cards as well.