A Georgia man was arrested on Saturday for allegedly playing a criminally hilarious practical joke where he surreptitiously added weed killer to a co-worker’s water, the New York Daily News reports.

Authorities say 65-year-old Anthony Gerald Dunton “placed amounts of concentrated Roundup brand weed and grass killer” in his co-worker’s unattended water bottle four or five times. From The Atlanta Journal-Constitution:

Dunton’s co-worker noticed his water tasted odd and that it foamed when shaken, he told police. The co-worker set up a a camera in his office and obtained two videos from two different days showing Dunton entering the office, removing the water bottle, and returning it moments later, according to police.

In one video, Dunton could be seen wiping the bottle remove fingerprints before returning it to his co-worker’s desk, police said.

According to police, Dunton admitted to putting weed killer in the victim’s water, but denied trying to kill him, saying he just wanted to “mess with him.”

The latter-day Ashton Kutcher reportedly now faces four counts of aggravated assault.

[Image via Cobb County Sheriff’s Office]