California Man Allegedly Poisoned Girlfriend with Visine

After getting sick, Shayne Carpenter's girlfriend found evidence on his phone.
2:03 | 03/13/13

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Transcript for California Man Allegedly Poisoned Girlfriend with Visine
To you to that bizarre story out of california. A man charged with allegedly using visine to poisehis girlfriend. First she got sick then she got suspicious and it's what she found in his phone records that convinced her to go straight to the police. Abc's abbie boudreau has that story for us. Reporter: A california woman says she got a real opener this weekend when she discovered that her boyfriend admitted to poisoning her with vi visine. Police say 27-year-old shayne carpenter bragged to his buddies about spiking his girlfriend's drink with the eye drops after an argument hoping to induce the stomach churning effects of drinking the drops. She found some texts that made some reference to if she's going to be talking crap then she's going to be crapping. Reporter: But the alleged prank turned dangerous. His girlfriend falling so ill she ended up in the hospital. Carpenter confessed to police who hauled him off to jail. Then ingested eye drops can cause dangerous side effects like blurred vision, respiratory failure, seizures and vo eye drops. Reporter: In the movie "wedding crashers." Bradley cooper's character was unknowingly poisoned at the dinner table and later paid the painful price. And in real life intentional poisonings are a real problem. Not just involving eye drops but other types of poisoning too with about 15,000 incidents a year. Experts say women are usually the culprits. They see it as something that they can control and cause someone else discomfort with very little work on their part. Reporter: And authorities say this woman put eye drops in her boyfriend's water about a dozen times over three years and reportedly said she did it so he'd pay her or attention. As for carpenter's girlfriend she is now out of the hospital and he's now out of jail after posting posting a $25,000 bail, a pricey prank thathing. For "good morning america," abbie boudreau, abc news, los angeles.

This transcript has been automatically generated and may not be 100% accurate.

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