It’s an old telephone prank: Do you have Prince Albert in a can?
Yes? Then you better let him out before he suffocates!
(Prince Albert is… or was?.. a popular brand of pipe tobacco)

An Icelandic teenager tricked the White House into thinking he was Iceland’s President Olafur Ragnar Grimsson. (BBC News)

Dial this into your phone during your next call:
1-1-9-9-#-#-9 (pause) 6-6-3-3-2-2-1
It’s twinkle twinkle little star…

Listen to this: Little Irish Girl Prank Calls. (Merchant Prince)