If you're a passionate football fan, you can probably remember a time when you've got yourself so wrapped up in the action that you've momentarily lost sense of your immediate surroundings.
We can assume that's exactly what happened to this young Porto fan on Wednesday evening.
2004 European Cup winners Porto hosted FC Copenhagen in their opening Champions League fixture of the season. While it's fair to say that Porto aren't the force they once were in the continental game, most would have expected them to overcome their Danish opponents.
However, having taken the lead from Otavio Monteiro's first half goal, things didn't go to plan for the home side.
First they were pegged back through a goal from former Cardiff City striker, Andreas Cornelius. Then, following Jan Gregus's dismissal for the Danes, Porto were frustrated as they tried to make the most of their numerical advantage.
Despite going close with a couple of late chances, they couldn't find a second goal - to the annoyance of this supporter, who inadvertently clouts the girl next to him on the head.
https://twitter.com/WAFCAaron/status/776161394983071744
Although he instantly apologises, the clip ends before we can see what happens next.
Porto's next Champions League fixture sees them travel to the King Power Stadium where they face English Champions Leicester, who top their group after their 3-0 win in Brugge.
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