Way too hard to choose just one, but my favourites....
Are You Now Or Have You Ever Been?
Guise Will Be Guise
The Shroud of Rahmon
The Trial
Reunion
Redefinition
Reprise
Epiphany
Disharmony
Dead End
The Pylea Arc....
Okay, I may as well have just written out the Season list. 🙂 I don't think an explanation is needed for each of them, and most of the reasons have been covered.
Guise Will Be Guise, The Shroud of Rahmon & Disharmony were the funniest ones, some great moments in there. Wesley as Angel. 😀 All the vampire rules, he came in before he was in invited so he jumps out, walks in again. The mirror, the cross, the blood. That one not so much funny, more incredibly gross. 🙂 Angel with his Jay-Don impression, endless quotes there. And Disharmony, well that was just a funny episode as a whole. 🙂 Love the scene, when the gang's walking, shoulder to shoulder, down the sidewalk outside of Caritas. The camera pans across from a serious and focused Wesley, to Gunn, to Angel, to Cordelia and then on to - a grinning Harmony. 😀 Cordy does a double take when she suddenly notices Harmony walking beside her.
Reunion & Redefinition are two great episodes. Like Lindsey McDonald, I was completely shocked when Dru walked through the door! 😱 Had no idea that was coming!