Hands down. No competition. Nothing comes close to that crazy, gross gross gross dude. Mild spoilers for fun Trevor moments (nothing for the plot) in the video above. If you rather have your experience completely fresh, feel free to skip this one.
The folks at Machinima put together a montage of Trevor's transition moments — those moments where you switch over to one of the three protagonists in GTA V and catch them in the middle of doing whatever they happen to be doing at that time. For Trevor, it almost always involves yelling, throwing things and getting in people's faces all while probably sporting his stained tighty whities. It's part of why he's the best character of the three.