This is why I should carry a notebook.

Last night as I was writing in my diary, a very hilarious joke about heroin popped into my head. In fact, it was so hilarious that I figured I’d remember it forever so there was no need to write it down. Now today, 24 hours later, the joke is gone, lost forever. In my diary it just says “heroin joke, write it tomorrow” which in retrospect was a bad idea. Lesson learned.