Talk about cutthroat.

SFGate reports.

Former Stanford grad student accused of poisoning classmates

A former graduate student at Stanford University is facing four felony charges of attempting to poison her classmates by secretly dumping a chemical into their water bottles, according to court documents.

Starting in September, medical students working in a lab at the university began to notice an odd smell — later determined to be paraformaldehyde — coming from water bottles that had been left out, documents showed.

On a few occasions, some students complained of irritation and burning after drinking from their water bottles, according to a criminal complaint filed with the Santa Clara County district attorney’s office first reported by the Fountain Hopper, an anonymous campus publication.

“I think someone is trying to kill me!” exclaimed one of the victims after sipping from an allegedly tainted water bottle, according to a statement given to the Stanford University Department of Public Safety.