1) Pluto was actually detected in 1919, but no one noticed. http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
2) Pluto's orbit crosses Neptune, but they'll never collide. http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
3) Pluto is the biggest survivor of Neptune's wrath. http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
4) [our estimates of] Pluto is shrinking! http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
5) It's not the biggest object out there in the black http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
6) It has an atmosphere http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
7) It's a double planet http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
8) We have maps of its surface, even though telescopes can barely see any features. http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
9) Its pole is tilted more than Uranus's (122 vs. 98 degrees) http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
10) It's called an ice world but it's almost 70% rock on the inside. http://blogs.discovermagazine.com/badastronomy/2009/03/13/te...
And because it is on topic: http://xkcd.com/473/