why is it so impossible to ever find things again on Tumblr?

Recently I saw a webcomic on Tumblr (I don't think it originated there though), that was a couple of panels, all the same size iirc, where the protagonist wakes up having to do a "thing" today and goes through their day being reminded by others and reminding themselves to "Do the thing!" in increasingly dramatic fashion (one panel even had skywriting), with last panel showing them lying in bed at night realizing "I haven't done the thing."

I wanted to link someone to it, but now I can find it. Does anyone know the comic I'm talking about?