Your Favourite GTA Moment

Vice City:
The dialog between Ken Rosenberg and Tommy Vercetti when they get back to Rosenberg's office, at the very beginning of the game. It starts by Tommy telling Ken to « Shut up, sit down, relax. »
When Ken tells Tommy to buy new clothes, because it isn't 1978 anymore.

San Andreas:
When Big Smoke orders a shitload of food at the Cluckin' Bell (« I'll have two Number 9, a Number 9 large, a Number 6 with extra dip, a Number 7, two Number 45, one with cheese, and a large soda. »), and keeps eating even when the Ballas try to kill CJ, Ryder, Sweet and him.
A classic: « All you had to do was follow the damn train, CJ! ».
When I first discovered Mount Chiliad, and kept trying to climb it with every vehicle, and jump from the top.
When Catalina makes CJ have sex with her on a rack, in her cabin.
When CJ has to kill the gimp…
When CJ tells his brother Sweet about Maccer's masturbation problem, and Sweet answers with a ton of sexual metaphores like « He likes to consult Professor Hans Jerkov? ».
When I finally found the Euros and could complete the vehicle export missions.

How could I have forgotten this Vice City moment…: the French guy who can't speak English!

@3:25

In the early days of GTA III when general consensus among the online GTA community was that the Dodo was impossible to fly for any decent length of time and I taught myself to fly it around the entire map, past the ghost town and land it beside the 'you weren't supposed to be able to get here' sign etc. Sounds like nothing now when all these years have passed but back in the day it was a pretty rare feat to be able to fly that clip-winged little devil.

When I first played SA with a long forgotten friend we stole a ambulance and run over everybody at the beach. Since that day I know what I wanted most in life.

Winning a race on GTA Online with a Voltic against Zentornos.