best one I read involved Mac having downed a potion of immortality YEARS ago. Lets just say when Applebloom discovers the truth, SHE CAN'T HAAAAANDLE THE TRUTH. spoilers: He married Granny Smith. Your mind can extrapolate the rest.
First Panel: I know AJ, I hate it, but it can be funny! Second Panel: Agreed, I honestly also find that gross, but I guess everyone's entitled to what they want to think. Third Panel: Yes AJ! That's the earth pony we know and love! AJ FTW! Fourth Panel: ...WHAT? DAMMIT!