1. The Running Gags
There are all sorts of running gags throughout the series that are consistently funny. These include the characters hating on Glee (and subsequently having to be the Glee Club), the aforementioned awwws, the thrice repeated question mimicking Bueller? Bueller? Bueller?, references to the size of Jeffs forehead, a big gasp (sarcastic or not), Troy and Abeds particularly close relationship and Shut up, Leonard! Somehow these gags (and the rest) never get old, and the show wouldnt be Community without them. For some series, by their third or so season these jokes stop being funny and are begging for a new lease of life, but here they are all such brief instances that they havent yet overstayed their welcome.