uefa.com never ceases to learn something new about the UEFA Champions League - here are the key lessons from Matchday 3.
1. Oliver Kahn still tops for Bayern
Kahn's form earlier this season had left some doubt as to whether he could remain FC Bayern München's goalkeeping inspiration. Any questions were answered on Tuesday when he produced a spectacular late save from his former Bayern team-mate Giovane Elber to ensure the German champions a point at Olympique Lyonnais.
2. It is harder to win against ten men - honest!
Celtic FC's travelling fans were rubbing their hands with glee in Brussels when RSC Anderlecht captain Glen De Boeck was shown his second yellow card after just 26 minutes. But Celtic reckoned without man-of-the-match Aruna Dindane, whose glorious strike 20 minutes from time sealed a 1-0 win for Anderlecht.
3. The Old Lady is still grand in Turin
Italian champions Juventus FC have shaken off the disappointment of losing last season's final on penalties in fine fashion. They turned on the style again at home to Real Sociedad de Fútbol, who like Juve had won their first two games, David Trezeguet and Marco Di Vaio both scoring twice in a 4-2 victory.
4. Beware of the coupon buster
Punters in the know would have fancied a home win for AC Milan against Club Brugge KV as a banker. But Brugge supporters would have made more than a few Euros betting on their team after they produced the shock of Matchday 3 with a 1-0 away triumph.
5. A change is as good as a rest
Claudio Ranieri showed his tinkering can work after an inspired substitution helped Chelsea FC overcome S.S. Lazio. With the score at 1-1 with 26 minutes left, Ranieri sent on Jesper Grønkjær - and with his first touch the substitute crossed for Adrian Mutu to score Chelsea's winner.
6. A change is not always as good as a rest
Héctor Cúper's Internazionale FC had made a flying Champions League start despite disappointing domestic form. So when Cúper was sacked at the weekend, it seemed that caretaker Corrado Verdelli, marking time for permanent successor Alberto Zaccheroni, could call on that European confidence at FC Lokomotiv Moskva on Tuesday. After a 3-0 Lokomotiv victory, though, Zaccheroni's only consolation was that the only way is up.
7. Pay attention to teacher
Alex McLeish had the best years of his playing career under Sir Alex Ferguson at Aberdeen FC, but the pupil was outshone by the master on Wednesday as Sir Alex's Manchester United FC prevailed 1-0 at McLeish's Rangers FC. Ferguson has now won 50 Champions League games as a manager.
8. Domestic form goes out of the window in Europe
On paper, the side leading the English Premiership should figure strongly in the Champions League. However, Arsenal FC are now eight matches without a win in the competition after defeat by FC Dynamo Kyiv and now need a strong comeback to qualify.
9. Do believe the hype
David Beckham continued to win the hearts and minds of the Real Madrid CF faithful with another stylish performance in the 1-0 success against FK Partizan, sending in the corner that led to Raúl González scoring Madrid's winner - his 44th Champions League goal - and then blocking Ljubinko Drulovic's goalbound volley.
10. Dangerous Drogba shows no signs of stopping
Olympique de Marseille's Didier Drogba may have ended up on the losing side against Porto but he needed just 24 minutes to score his fifth goal of the competition, taking him two clear of his nearest rival.
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