A Courier Locker

You're not stupid. No way you're sending a potentially unknown object to your home or place of work. You organize one of those on-street lockers to get your package dropped off.

When you are notified of its arrival, you head off and collect the package before slipping into a quiet and nearby alley to open it. Inside is a strange, customized bottle. Its black in color and inscribed with various symbols - most of which you don't recognize - which seem to grow vaguely red in the light. You take out your phone and record a quick video to send to your guillable friends.

"Hey, got a bottle of that alleged 'Perfect Partner Juice' you people believe in. Gonna drink this down and when next I see you - assuming this trash doesn't kill me or make me high - I'm sure I'm going to look exactly the same. Bottoms up."

With that, you chug the contents.

It burns like hell. It tastes like you're drinking hot sauce straight out of the bottle.

You **** it down. You stand there for a bit. 1 minute. 2. Nothing happens. You feel whatever small doubt you have fading as a smug confidence that you were never 'got' by this ridiculous hoax flows over you.

Then, you feel it.

Your heart begins pounding. You feel light-headed. A thought emerges in your head - speaking in our voice but somehow obviously foreign. It begs, pleads and demands that you simply have to find someone - anyone - and ask them who their perfect partner would be.

You can feel your conscious ability to control yourself slipping away, but you have some time to try to steer this towards some goal before losing control completely.