Celestia: I dont know all, if I truly know all, do think i will know Sunset will betray my trust? Do you think will know Chrysalis plan? do you think i know i will lose against her? do think i know You will join force with Tirek, do think i know ..(Discord shut her up with his tailnot his dick for those think porn all the time)  
Discord: Ok ok ok, You know all by a 1000 years of live experiense, Happy?  
Celestia: Yes but If i know all, like you say, I will know Luna will become Nightmare moon and will stop her and do what is need to she not become Nightmare moon!  
Discord: OK FOR SCORPANT SAKE! I GET IT!  
Celestia: Oh Discord?  
Discord: WHAT?!  
Celestia: Fluttershy want see you! and she not happy, what you done again, this time?  
Discord: Oh….(he teleport to see Fluttershy and to fixe his mistake)  
Celestia:….You know Discord, you are not the first who belive i know all!

which is why discord was always so annoyed with celestia even on the show

Yeah Celestial. Stahp.

True. Celestia! NO! STOP IT!