Six cows crashed a house party on Main Street and wound up drinking the beer left behind on a picnic table when the partygoers fled.
Police Lt. James Riter said he got a call about 9 p.m. Sunday for cows in the road on Main Street near Foster Street close to the town line with North Andover.
Riter said when he arrived, he found "evidence" in the street that the cows had been there, but the animals were gone. He found them a short distance away on the side of the road, and they wandered into the front yard of a Main Street home.
About a dozen young adults were having a party in the back yard, so the cows sort of wandered around the house and into the back yard, their arrival drawing screams and laughter from the gathering.
Riter said the partygoers decamped to the deck, abandoning their beverages, and watched as the cows approached the picnic table.
The thirsty creatures knocked over the plastic cups of Bud Light and Miller Light beer that were left on the table and began slurping away at the beer.
"They seemed to prefer the Bud Light," Riter observed.
One of the cows tipped over a recycling bin and began drinking beer from it, he said.
The owner of the cows showed up with a friend and nudged them back into the front yard and then onto the street where, clutching a bucket of grain he was able to guide them, with a police escort back to their field.