Weekly Anime Comics: Cardcaptor Sakura - page 25 (Patreon)

Oh, Tomoyo-chan. You so creepy.

...but seriously, I'm honestly a bit surprised episode 25 didn't end with some version of this joke.  Like, obviously they wouldn't adopt this TONE, but it still seems like a really obvious Tomoyo joke (then again, I know that the Mirror card comes up again later on, so maybe I'm just vaguely remembering a joke from later on?)