We present an analysis of dynamics of discussions on web forums related to football. The data are users' text comments from various forums threads. We collected them and classified as positive (1), negative (-1) and objective (0). After averaging in time windows we received two kinds of time series describing average emotional value and number of comments in a time interval (intensity of discussion). The data set was extracted from an unofficial Manchester United forum, where club's fans can discuss topics dealing with sport, football and their favourite Premier League club. We concentrated on one part of forum called Matchday Forum, where Match Threads exist. Every thread is devoted to another MU match. We studied how a goal during the match affects the forum dynamics. A large increase of intensity of discussion is observed after goals scored or lost and a decrease average emotional value - after lost goals. We show that relaxations relative changes of these observables can be described by power law functions.

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