At a backyard party in Boxford, Massachusetts, last weekend, a half-dozen bovine beer-lovers showed up sans RSVP to partake in the festivities.

Home owner Andrea Poritzky says she called the police after five or six cows suddenly showed up in her yard. She apparently noticed something was off when she realized she didn't own any cows.

Being uninvited didn't seem to bother the kine, which helped itself to a few cold ones. "They went right for the beer," said Lt. James Riter. "And then when one was done, they'd knock another one over and take care of that beer."

The party-pooping Boxford Police rounded up the tipsy cows, and escorted down the road to their farm.

[screengrab via WHDH]