We've all gone to football matches and seen supporters getting a bit shirty in the away end, but Lena Mari Edvardsen took things to a whole new level at White Hart Lane on Thursday.
The 19-year-old was with the Tromso supporters in the away end for the Europa League group stage clash with Tottenham when she decided to put on the top of her second team - Arsenal.
A photographer captured the moment before a security guard could ask the blonde to remove the 'Ozil 11' top, and the image quickly went viral.
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An Arsenal supporter got in touch to offer her a ticket to the game against Stoke on the weekend as a little thank-you for her stunt – but she won't be doing it again any time soon.
“I didn't expect there to be such a big reaction,” admitted Edvardsen in her first English-language interview on the furore.
“I only had the shirt on for five seconds but some guy took my picture and it got all over the internet.
“I didn't want to go to White Hart Lane as I am an Arsenal fan, but I am also a Tromso fan. I had a feeling we were going to lose so I took my shirt so I could feel good about myself and have some pride.
“And I have got a lot of reaction from all over the world. I've had over 500 friend requests on Facebook and a lot of messages – mostly good but some bad of course.
“I know some people got offended and I want to apologise for that as it was only a joke. It was pretty rude, I agree.”
Yet Edvardsen knows she will be welcome at the Emirates any time after her stunt.
She added: “I have a lot of Gooner friends now, and they offered me a ticket against Stoke. I got to go with them and we are friends now. It is good for me.
“A lot of people have got in touch and offered me tickets. It feels great.
“Would I do it again? I don't know if I dare! I'll just play it cool. I didn't mean to make it this big at all, and I am shocked to be honest.”