There is some really fun interaction going on here. The logo and the mouseover animation is brilliant, I love the top left treatment too. Down to the interactions over the work samples as you scroll down the home page which are nicely done as well. These guys really push it and I like that.
From the Designer:
Catalan design studio CocoBongo’s new portfolio site
Submitted by: Andros Guiradó
Twitter: @_Andros__
Role: Designer & Developer
Country: Catalunya