April's fool

Estaba repasando un Top 100 de April's Fool cuando me he encontrado con uno realmente curioso:

#21: Bombs Away!
1915: On April 1, 1915, in the midst of World War I, a French aviator flew over a German camp and dropped what appeared to be a huge bomb. The German soldiers immediately scattered in all directions, but no explosion followed. After some time, the soldiers crept back and gingerly approached the bomb. They discovered it was actually a large football with a note tied to it that read, "April Fool!"