Ray and Debra lose their cool when Frank and Marie pull the ultimate unannounced visit to their home. Their untimely appearance sets off a series of events that becomes the "straw that broke the camel's back" with respect to Ray's relationship with his parents. Meanwhile, Debra tries her best to play peacemaker among the family members and to get Ray to reveal the true reason for his hostility towards his folks.
An all-timer. This is the episode you show someone to explain why Everybody Loves Raymond matters — clear the evening and watch it properly.