I bite my tongue when things are cute.
When things are really really cute, I bite my tongue, like on the sides. Or the inside of my cheeks or sometimes even my lips. For instance, I know everyone thinks their pets are the cutest but I seriously have the cutest cat in the world. Everything about her and everything she does is completely adorable to me, so much so that it almost drives me nuts and....I bite my tongue, lol. It's not like I have some weird attraction to her or anything like that, I just love her a lot and think she's adorable. Anyone else out there bite your tongue when something is insanely cute?