A trick i learned a looong time ago is to open the reply in a new tab. That way, before i submit my reply, i can switch back to the original tab, press the Chatterbox "talk" button and not only ensure that i am quoting properly (etc.), but also ensure that i am not repeating what some quick draw monk has already posted.

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)