Before the pomp and circumstance for the Nationals’ home opener festivities on Friday, the clubhouse was nearly empty around 9:10 a.m.

Everything in the room looked familiar, except for a T-shirt on starting pitcher Foster Griffin’s chair. It wasn’t team-branded attire. On the back of the shirt was a quote from manager Blake Butera. A quick glance around the room revealed shirts on other chairs.

Slowly, players began to walk through the clubhouse wearing the T-shirts. Laughs commenced. The laughs grew louder with each passing player who walked through.

The front of the shirt displayed an cartoon version of Butera wearing sunglasses sitting in a laundry cart and holding a beer. The top read “Blake Butera” in cartoonish lettering and at the bottom, just below a row of cans of beer and shaving cream, were the words “All Kinds of Stuff.”

Following Butera’s first managerial win in the big leagues, a 10-4 victory over the Chicago Cubs on March 26, the Nationals celebrated by giving Butera a beer shower in the visiting clubhouse at Wrigley Field.

After the game, Butera said: “I got crushed. ... They grabbed me and next thing you know, there was a lot of liquids all over me in the shower. All kinds of stuff. Shaving cream, beer, you name it.”

The exact origin of the shirts is unclear. But for Butera, a first-time manager, the shirts were the first public example of his players poking fun at their 33-year-old leader.

They wore the shirts during pregame warmups and batting practice. And perhaps they’ll keep wearing them as the season progresses.