Saw a band called Efterklang last night (who were absolutely ace, by the way) at the Queens Social Club in Sheffield. The room was obviously used for bingo a lot, hence this wonderful sign:

Turns out bingo calling slang is very inventive…
37 = a flea in heaven
44 = droopy drawers
26 = bed and breakfast (The traditional price of a B&B was 2 shillings and 6 pence – 2 and 6)
(For a full tutorial, see Bingo Calling for Beginners)