This is a video edited by Jeffim Sheroky of R2-D2 daydreaming about better times after an elderly Obi-Wan Kenobi fails to recognize him on Tatooine. Plus it's all set to a cover of 'Mad World' for extra emotion. That poor droid. How do you have so many memories with someone, then fail to recognize them? That's like something you pretend to do to frenemies. I mean, C-3PO, sure, forget you know him all day long, but R2-D2? Fan theory: Obi-Wan had dementia.
Keep going for the video while Obi-Wan contemplates if that's even the droid he's been looking for.
Thanks to Robyn, who agrees that's a face nobody could forget.