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 generic plastic bottle - no label or anything. You consider the possibility that this is poisoned or something, but what matters is that you have a point to prove. 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's awful. It has the same consistency as some of the worst allegedly liquid medicine you have taken - similar to watery oatmeal - and tastes about the same. 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.