1921: The Egyptologist William Flinders Petrie excavated at Abydos over four seasons at the turn of the century. Flinders Petrie was a penny pincher; at the end of each digging season he reputedly buried unused cans of food. These were dug up at the start of the next season and thrown against a wall; any that did not explode were considered fit to eat. Flinders Petrie spent another season at Abydos in 1921. After an absence of 20 years, his return must have been explosive.
Source: David O’Connor, Abydos: Egypt’s First Pharaohs and the Cult of Osiris (2011), p. 27