Nothing particular. Just many events over the years. Just a small sampling that comes straight to my mind:
2006 blames Renault for not wanting him to win championship because he is moving to McLaren.
Whole 2007. Alonso loses to rookie and completely loses it. For example blocks Hamilton in Hungary qualifying. Blackmails Dennis for #1 driver treatment etc.
Is involved in Singapore 2008 crashgate and calls it his best win ever later or some crap.
In 2012 keeps talking about how much Ferrari is slower than everyone else and how he is so amazingly good and extracts everything all the time from it. Even when he loses three tenths to Massa claims he did perfect lap and extracted maximum. Gives himself perfect 10 for the season even thou he regularly was slower than Massa late in the season and in Suzuka made a huge mistake at the start causing a retirement.
It's amazing to me how this douchebag has any non-Spanish fans and how some people gobble up his crap like it's ambrosia.