Very familiar indeed, which of course means that he also has extensive experience in continuing to talk in the vicinity of an Enjolras who isn't actually paying attention to him.

"Oh, you lack imagination, in that case. Imagine me vociferously defending the Discourse on Inequality and then rounding to the other side of a table to denounce it as so many empty words on a page. Long enough and I would start to vehemently interrupt myself. Perhaps I would throw a half-eaten pastry at myself in a fit of pique, although I would end up needing to apologize to Laertes for thoughtlessly wasting his hard work in a moment of passion, for surely the pain au chocolat is not meant as a weapon. Although perhaps a debate then about what foodstuff would make the best weapon, citing historical precedent..."