Ahem... yeah... so, to get us back on track, a minor Don't.
I have two bottles of 'hippy oil' - scented oils. The bottles are identical, but one oil I need to virtually coat myself in to smell, the other, half a drop then wipe it off to be socially acceptable.
One day I thought I was putting on the 'coat yourself' scent, only too late realised it was the 'whew who died in the flower farm?' scent. Cue frantic washing off, washing off again, trying a third time... and still raised eyebrows when I got to work.
The kicker? The bottles are clear glass, and one liquid is deep purple, the other bright yellow. D'uh.