I can’t find the original post now, but a while ago Greta Christina (I’m almost positive it was her) posted about words which are in some way self-reinforcing when said aloud. (It may have been a series of tweets rather than a blog post and that’s why I can’t track it down, I’ve no idea.)
Her suggestions, if memory serves, included “rum” – because when you’re slightly tipsy on rum, saying the word “rum” and really drawing out every phoneme makes you sound/feel even more drunk – and “grump/grumpy” – in that, calling you a grump or asking why you’re grumpy is a great way of making you even grumpier.
Anyway, something made me think of this the other day and I realised I had a couple to add to the list:
Perhaps because the word so successfully sounds like what it describes, I can’t remember ever seeing someone successfully describe someone else as “sneering” without sounding sneery themselves;
and, accusing someone else of being the “Twitter police” invariably makes you sound like the Twitter police.