S1 - Surprise to no one but "it's ok to run away"!

S2 - So so many fantastic scenes to choose from (Mob reconstructing Emi's manuscript, everything in episode 5, "my shishou is a good person", Mob's wildly spiraling emotions culminating in him choosing to stay and talk with Touichirou being among some of my very favorites), but I'm actually going to go with one that also doubles as my favorite Mobreimob moment, and that's the meeting with the ghost family in episode 3. I love the quiet, eerie atmosphere, the understated way Reigen manages to comfort Mob, the themes it establishes for the Mogami arc and the rest of the series as a whole, and I just love the "what if the spooky ghosts are actually sympathetic and lonely" angle in general.

S3 - EVEN HARDER TO PICK JUST ONE I love love love the confession scene it squeezes my heart just thinking about it and the buildup to it and the epilogue with Reigen's birthday but...I think my actual favorite is when the gang gets to hang out with the aliens in episode 7? I love the quiet, relaxed mood of that episode in general (not to mention all the beautiful scenery and Hakuyu Go's return with stunning animation) but the coziness of their time with the aliens makes me indescribably happy every time I watch it. It has a similar appeal as the ghost family scene, now that I think of it? The idea of what if that "scary, unknown" entity was actually benevolent and friendly (...hey, kind of like the entire concept of ???%, huh, I never would have made that thematic connection until now).