Packers Fan Dumps Beer All Over Amon-Ra St. Brown During TD Celebration

A Green Bay Packers fan was so annoyed with Amon-Ra St. Brown following his touchdown on Thursday night, he dumped his beer all over the Lions star's head.

The incident happened in the first quarter of Detroit's "Thursday Night Football" game against Green Bay ... when St. Brown hauled in a 24-yard TD -- and then headed for some front-row seats to celebrate with Lions fans.

The 23-year-old did his version of the Lambeau Leap -- jumping over a wall behind the end zone into the waiting arms of several people decked out in blue and silver -- and while he initially was having a good time, a Green Bay fan decided to ruin the moment.

You can see in a replay of the celly, the Packers fan reached out with his drink and poured it on St. Brown's helmet. Just seconds later, the wide receiver hopped down and rejoined his team.

It's unclear if the fan was punished for the act ... or if St. Brown even noticed amid all the chaos in the stands. After the game, though, he did joke about the celebration to reporters, saying, "I lost my Lambeau Leap virginity."

In the past, cops have investigated similar incidents at NFL stadiums -- you'll recall, in 2018, the Foxborough Police Dept. launched a probe into a fan after he was seen throwing beer on Tyreek Hill following a touchdown at Gillette Stadium.

No word yet if the Green Bay Police Dept. is involved in Thursday night's incident ... we've reached out to cops for comment, but haven't heard back.