Lately, I have been waking up with a brilliant idea in my mind, only to discover on later reflection that it's completely useless. Here's one recent example:
Web programmers! Do you find it too tedious to insert comments into your hand-written HTML files! Is that open-bracket, exclamation mark, hyphen hyphen just too tiresome for you? Then why not try including comments simply by writing them following a # at the end of your embedded URLs, like:
It's easy, and fun!