Whether it was because of the result, the way the game was played or simply the teams that were facing each other (any reason why you consider it bizarre).
For me the strangest/bizarre matches were the matches between national teams and clubs:
Boca Juniors Vs. México
Bayern Vs. Netherlands
Loma Negra (Argentine Club) Vs. URSS
Atlético Socoraba (Brazilian Club) Vs. North Korea
Newcastle vs Aston Villa. That game where Bowyer and Dyer had a fight. The pitch even though they were both playing for Newcastle.