Seems like an easy option soy sauce is more thick than flat coke.
All of them give off a smell that are easily recognisable
Tabasco sauce wouldn't move In the cup as smoothly as tomatoe juice
11
·
Edited 8 years ago
deleted
· 8 years ago
Maybe out cling wrap over the top of them to make the smell less obvious, and after you pick up a cup, you can't set it back and choose the other. That way, if you notice the thickness, you're still screwed.
All of them give off a smell that are easily recognisable
Tabasco sauce wouldn't move In the cup as smoothly as tomatoe juice