I dont know if you've posted it already and I cant be arsed to go through it all but my fav C & H cartton is where Hobbes is sat under a tree Calvin comes over and says "Hey Hobbes watcha doin'?"
H - "Nothing"
C - "I'll help!"
H - "Please do..."
Or the one where there sat on a hill and Hobbes asked Calvin if he believes in God and Calvin replies "Well someones out to get me!"