Nichijou/YMMV

Non Sequitur Scene: Almost once an episode with the Helvetica Standard segments which indulge in Art Shift and frequently make no sense at all.
Crowning Moment of Awesome: Yuuko(!!!), of all people, gets one in episode 16 when after confirming (with the Professor's help.) that Nano was a robot, tells her that "I know that you aren't a robot. Nano-chan is just Nano-chan.". Not only Yuuko let it clear that she didn't mind that Nano is a robot and considers her friend, as it also helps Nano to accept herself.. A CMOH and a CMOA in a single strike: well done, Yuuko! :-)
- And then Sakamoto accidentally talks in front of her, telling her goodnight. "Meh, whatever."
Ear Worm: Both OPs.
- "Hyadain's Uh-uh-un Unrequited Love-C".
- The ending theme, "Zzz" by Sayaka Sasaki, doesn't let up either in its sweet cheeriness. Awww!
Memetic Mutation: It is rather popular to photoshop other characters in the Nichijou art style. Some examples for your viewing pleasure. This is known as "Nichijou OP Parody" on the popular Pixiv art site.
Moe: Absolutely freaking everyone. At least all the girls—although a few of the boys have their moments.
Most Annoying Sound: Episode 21- *smack*-EEK! *smack*-EEK! *smack*-EEK! It only lasts about 16 seconds, but it obtains this status after about 4.
- The scene is widely regarded as a parody of YouTube Poop and similar vids (albeit ones on Nico).
Nightmare Fuel: When Sakamoto got stuck in the superglue. Unlike the Professor and Nano, he was entirely engulfed. "I might die", indeed.
- As with K-On!, the use of the song "Tsubasa wo Kudasai" in one of the endings might cause Mood Whiplash for some after watching Rebuild of Evangelion.
Tear Jerker: In the "Small thoughts" segment of episode 10, a teacher is talking about how people respond to either praise or punishments. A girl at the distance thinks: "I react to praise... but I never am..."
- The scene in Episode 13 where :the Professor allows Nano to go to school is more of a Heartwarming moment, but for all the problems Nano deals with, a lot of viewers feel tears welling up.
Values Dissonance: Ep 24. The first time Sasahara talks to Mio is marked by an Imagine Spot of a bunch of Mios... raising the flag on Iwo Jima?
The Woobie: Don't you just wanna give Sakurai-sensei a hug?
- Same goes for Nano, big time.
- And via Fridge Horror and Fan Wank, courtesy of /a/:^{[dead link]} Yuuko.