The opening credits scene with Baby Groot dancing to "Mr. Blue Sky"
Any time Drax laughed (Dave Bautista's got such an infectious laugh, I can't help it)
Rocket vs. the Ravagers in the woods
Yondu, Rocket and Groot's prison escape
The 700 jumps to Ego's planet including Stan Lee with the Watchers
Quill overcoming Ego's grip set to "The Chain"
Yondu's sacrifice
The Ravager funeral ending, which was one of the most beautiful scenes in any Marvel movie to date.
And of course, Teenage Groot