Two California teenagers were arrested on New Year’s Eve after allegedly spiking one of their parents’ milkshakes with sleeping medication. The girls did this, the local police said, because one girl felt her parents’ Internet curfew was too strict. The parents apparently restricted access to the family’s wireless Internet connection after 10pm.

“The unsuspecting parents consumed only about a quarter of their shakes thinking that they tasted very odd,” the police in Rocklin, California (22 miles northeast of the state capital, Sacramento) reported.

“However, they consumed enough of the medicine for it to take effect within an hour and fell asleep. The parents did not awake until the following morning and did not remember what had occurred.”

Police told the Sacramento Bee that after waking once during the night with headaches and grogginess that persisted until morning, the adults went to the police to get a $5 drug test kit.

"Many parents buy them and have their kids' urine tested," Lt. Lon Milka, a Rocklin police spokesperson, told the paper. When the parents found out they had been drugged, they alerted the police, who promptly arrested the teens on charges of conspiracy and willfully mingling a pharmaceutical with food.

The names of the 15- and 16-year-old girls—who were booked in Placer County Juvenile Hall on December 31, 2012—are being withheld as they are minors.

"The girls wanted to use the Internet, and they'd go to whatever means they had to," Milka added. "If they were adults, they could be facing prison time.”