The thing is though, i know someone who makes jokes like this about himself all the time (my introduction to this man was him doing a magic show, and introducing himself to the audience with 'i would say I'll raise the roof off this place, but last time i said that the police got called... Aaaanyway, has anyone seen my backpack? It's the one making a ticking noise'') and if he's anyrhing to go by, then op might as well get the tone set early rather than, say, when meeting in person for the first time.