Surprise party
A surprise party is a party thrown for someone who does not know that it has been planned; surprise parties can leave people feeling happy, because someone has made the effort to organize it for them. Many surprise parties are for birthdays; when the guest of honour arrives, everybody yells, "Surprise!" as loudly as they possibly can.
Surprise Party Media
Hip, Hip, Hurrah! (1888) by Peder Severin Krøyer, a painting portraying an artists' party in 19th-century Denmark
A September 1945 street party in Selborne Road, Margate, celebrating victory in the Second World War
A birthday cake with lit novelty candles
Folk dance in an Assyrian party, Chicago, Illinois
A dance party supported by a live band (SO36, Berlin)