Watercolor water that erases memories. Oh, wait, no, no, sorry, sorry, IT'S... IT'S UNICORN BLOOD. Unicorn blood that erases memories. Yes, yes, the thing is: there is no limitation to this potion. That's what makes it so dangerous. One sip and you're suddenly an amnesiac with no recollection of anything, including your own name. If you do purchase this, just be sure not to accidentally leave it around for your brother to happen upon.