– Rachel demonstrates her lack of understanding of the real world
– Monica anal-retentively cleans or straightens up
– Phoebe says a “Phoebism”
– Ross gazes longingly at Rachel
– Joey doesn’t understand something that should be perfectly obvious
– Chandler makes a deadpan smartass response to a stupid comment
– any main character makes a sweeping generalization about the opposite sex
– someone mentions or sees Ugly Naked Guy
– any of the main characters drinks any coffee product
– the exterior of Central Perk is shown
– the interior of Chandler’s and Joey’s apartment is shown
– any of the main characters’ parents show up
– any of the main characters are shown at work
– any of the main characters hug