"I might be the best nightmare you've never had". I would say that this is a custom sticker, but it applies to so many individuals with whom I'm acquainted that I merely dedicate it to them all (and you know who you are). Transparent and will work on light and dark backgrounds both (but will have a slightly different look on each, see image above and catalog icon for the contrast).
A spiffy little gift for your best nightmare, too.