Adams family
From Tardis Wiki, the free Doctor Who reference
The Adams family owned the Regal Cinema in Splott from 1897.
While briefing Jack Harkness on the data, Ianto Jones shot him a brief glance after saying the name. Jack mimed pulling a zip across his mouth and replied "My lips are sealed". (PROSE: Bay of the Dead)
This short exchange was due to the Adams family sharing their name with another well known family. (PROSE: The Stone House, TV: Flatline)