I was also on a bus recently when a couple of teenage girls got on. The first one announced loudly to the second one "Oh my god, I'm like, literally, gonna sit here".
To which I found myself silently mocking her ridiculous use of the word "literally". I mean, I suppose it was TECHNICALLY true...
Not so much physical signs, but I did have to go into the Lakeland store in Churchill Square the other week, and I found myself picking up some kitchen gadget or other and thinking "Ooooh, what a GREAT idea that is, how useful".
I almost ran out of the store in sheer horror at myself.