I lived in Los Angeles for 15 years, so I have too many mundane celeb sightings to pick one. Instead, I will just tell you whether a particular famous person is a total dick or not based on my brief observation or interaction.

Here we go!

Jake Gyllenhaal: seemed nice

Adrian Grenier: seemed chill

Bradley Cooper: total dick

Jessica Alba: is a (good, probably) witch with the ability to stop time, and also a good driver.

Amber Tamblyn: excellent taste in hats and very nice

Sanaa Lathan: absolutely effing rad

Alyson Hannigan & Alexis Denisof: I would have a 3some with them in a heartbeat b/c they are way hotter in person than I expected.

Pat Sajak: 100% dick

Marlee Matlin: seemed very cool

Gabrielle Union: cool AF

Wyclef Jean: awesomesauce

Chad Michael Murray: total dick

Kristen Bell: was totally a dick to someone but they totally deserved it so I respect that a lot. Mark her down as cool overall.

The Cast of Real World: Paris - all hot messes, except for Irish gay Simon, who was cool AF

Bradley Cooper: such a dick I had to say it twice

Sophia Loren: the bearing (and breasts) of a literal goddess among men.

Al Roker: exactly the nice guy you'd expect him to be.

Kevin Spacey: exactly the predatory creep you'd expect him to be.

That's all I recall at the moment but I will append this thread if I remember more.