Noticed my tits bouncing when I was bouncing up and down earlier (as I often do when I'm thinking about something, bored, or excited). Checked; just hit C cup (my wife is an A cup). I think I'm going to hit a genetic limit pretty soon; none of the women in my family have tits bigger than C unless they're pregnant.

Have started to have people notice them, but still just have deniability (there are guys walking around Hell's Kitchen with bigger pecs than that).