It first appeared in the Season 2 episode "The Old and the Restless". Lincoln came to visit Pop-Pop, and he finds out that it is run by the overly strict nurse, Sue. She sets up really strict rules for the home's residents, and she has a curfew, in which if they are outside after 6 o'clock, they get kicked out.
When Lincoln and Albert go out for a fun day together, they hurry back only to find that they're too late, and Sue has already locked up. But Albert's friends refuse to let him get kicked out, and Sue reluctantly lets Albert stay, and stops treating the others like little kids, letting them do what they want around the home.