Why have arsenal been beating the best team in in the premiership?

i think it's because the atmosfer. playing againts strong team make the tension goes higher. coz the skill of each team almost the same. the match also become one way to prove who is the best of them.

Well i dont care , actually wats the use he defeats chelsea on a nite and gets thrashed by fulham the reason i would say is the squad is young and they arnt accoustomed to english football here to win a game is diferent to play against teams like west ham , pompey , u need big heart and u must be physically strong and u must be well motivated and arsenal has very young team and they arent tuned in the right mind set ,to defeat these teams where sa they play teams like manutd or chelsea the players perform to their potentials in england u must also hav enough character to win the dirty games , against the likes of west ham and fulham , and wenger has to realise that