What is Giuseppe Guerini's victory on Alpe d'Huez in Tour de France 1999 known for?

Explanation

Giuseppe Guerini (born 1970) is an Italian former professional cyclist. In 1997 and 1998 he placed third in Giro d'Italia. He is particularly well known for his crash with a spectator during Tour de France 1999. Leading the 10th stage, a spectator wanted to take a photo and crashed with the rider just before the finishing line. Despite him falling off his bike, he got back on, and won the stage. Six years later, in Tour de France 2005, he won another stage victory.