Stealthy self-entertainment is my niche

Make faces at her, exaggeratedly roll my eyes and balance whatever fidget toys are on the table next to me on my head when she's looking down at something or putting down notes. Hehehheheheheheheh

Play the mirror game. When I catch her mirroring me and I subtly go back to the posture I was making previously (if I cross my legs, she crosses hers, I uncross mine, etc she should be happy I'm working her gluteus). I do it when I'm bored of what we're talking about. But it ends when she wraps up whatever she's going on about with "does that make sense? do you see what I'm saying?" and I have to answer "uhhhh... yep"

Once in awhile I get too focused/aware of our eye contact, start thinking "you're holding her gaze for too long ok RIGHT EYE wait ok LEFT EYE no you're still holding it too long you weirdo you're overdoing it, just look at the ground" while consciously doing that triangle trick that makes you look interested (right eye, left eye, mouth) and making myself all dizzy. Eyeball tango!

Sometimes I actually pay attention. That's probably the weirdest thing I do.