Sorry for the double post because I cant find the edit button on my first post. 
In the mission "Robbing uncle Sam" when they arrived at the garage in Willowfield. 
Ryder: "Man that shit was tight" 
CJ: "Tight!?... Man the shit was shit" 
Ryder: "You said you are down for the homies but all you do is complain" 
In the mission "The Green Sabre" 
CJ: I gonna warn Sweet" 
*Phone ring*.... 
CJ: "Damn it Sweet pick it up, pick it up!" 
Sweet: "Hey wassup? You called me but i did'nt pick it up. leave a message after the.." 
CJ: "shit shit shit!" 
lol 
Best funniest quotes are Catalina's 
"Who are these cowboy assholes?" 
"Bleed! Mtherf*cker!" 
"Move your f*cking butt" 
*Your pathetic driving is causing them to escape" 
"I should cut your balls off" 
While walking on the streets 
Pedestrian talking to CJ: "Did someone died in your mouth?" lol 
Pedestrian: "Steroids makes your dick look what!?"