They're crazy, those rugby lads, what with their constantly hilarious exchanges on social media.
The latest online rib-tickler to come from Irish international rugby ranks, designed to show that underneath those impressive physiques lie razor-sharp brains, features an exchange between Brian O'Driscoll and Sean O'Brien.
BOD remarked that Sean (inset) seemed to be wearing an Irish jersey that was a couple of sizes to small for him, posting the hashtag "#nextsizeupmaybe?" Sean, quick as a flash, replied "Don't be worrying about it, your retired Remember!" - a retort that manages the rare feat of including two typos within the last three words.
Might one suggest that before he takes on BOD on Twitter, Sean may want to brush up on his grammar?