Shrek 2 (2004)
No cartoon will probably ever better Shrek (well Lion King did but that was before it), but this was still brilliant. These films aren't meant for kids, they're clearly made for film geeks, as every second joke is a nod to a classic film!
It also had the most profound line, which I feel I will be using at some point!
"Donkey, you HAVE the right to remain silent. What you lack is the capacity. "
9/10