Former Labour leader Neil Kinnock was ejected from his seat during a top-flight football match for upsetting fans with his wild celebrations.
The 71-year-old was overjoyed to see his beloved Cardiff City defeat Fulham at Craven Cottage in west London on Saturday.
But he was sitting in a home stand and his exuberant celebrations when the Bluebirds took a 12th-minute lead led to him being moved by a steward.
Club spokeswoman Sarah Brookes said the politician's celebrations caused angry responses from the home crowd.
She said: "Mr Kinnock was located in the home area celebrating a goal and was asked very politely by one of the stewards if he would like to sit with the away fans.
"We would do that with any fan who celebrates a goal because the home area is for home fans.
"You are sold a ticket to go in the correct area. It is in the interests of all fans so everyone can enjoy supporting their team.
"I don't know how he got the tickets."
Lord Kinnock, who is well used to banter and raucous behaviour after a life in Parliament, is believed to have been sitting with his grandchildren when they were moved from the Ernie Clay stand to a designated away area.
But he was not the only Cardiff fan sitting with Fulham fans.
Another supporter wrote on a forum: "Pleased to see Mr Kinnock sitting two rows in front of me in the Ernie Clay stand yesterday.
"I am not sure if Neil has as much experience as me of sitting with the home fans but his celebration of our first goal led to him being escorted from the stand.
"I however managed to remain undetected until Jordon [Mutch] banged in number two."
Cardiff, who Lord Kinnock has supported since boyhood, won the game 2-1.