Visine in someone's drink to give them diarrhea, any of you hear this myth before?

It happened it Wedding Crashers. It must be true.

it's not visine. it's some other liquid in a visine type bottle.

Never heard of that, but a drop of hydraulic fluid will give someone the squirts.

Reformulated to remove the thalene ingredients or whatever.

Phenolphthalein is your answer.

yup, had a supervisor spike my drink with phenolphthalein back in the late 90's. It aint no joke. Horrible horrible.

heard of it years ago. Knew a woman who was a bartender wand put it in her ex's and his date's drinks. She swears it worked.

So we've got a movie and a vindictive woman confirming this works. Must be true.

Side effects
A common urban legend is that a few drops of Visine in an unsuspecting victim's drink will cause harmless but debilitating bouts of explosive diarrhea, akin to that of a laxative.[3][3] This will not produce explosive diarrhea, but oral administration of Visine can induce dangerous side effects related to Visine's ingredient tetrahydrozoline hydrochloride such as:

Dangerously low body temperature (hypothermia)
Blurred vision
Nausea and vomiting (as opposed to explosive diarrhea)
Difficulty in breathing or even a complete halt in breathing
Elevating (hypertension) then dropping (hypotension) blood pressure
Possible coma
Seizures and tremors
Anyone ingesting Visine should get medical attention or contact a poison control center immediately.[4