My fav scenes would are all from Kickass.. Many of the scenes have already been discussed already here on this thread
In the scene which she leaves the Rasul's apartment, she tells Kickass not to use the front door. Her attitude towards Kickass was hilarious there...
Then shortly after, Kickass would exit through the window but actually looks down first (thinking normally, people would escape going down the stairs).. But then he sees that Hit-girl was actually climbing up the stairs instead. Just too funny...lol
The roof jump afterwards was funny and sad. Sad for Kickass because he must felt like a total outcast afterwards and got left behind.