This totally happened. One time, all the Humboldt Penguins were pooping all over each other for like 10 minutes. Every time I go back I see at least one get the drop on another.
Apparently they are just a very fecal species, and also make their nests in sea bird guano: http://www.stlzoo.org/animals/abouttheanimals/birds/penguins/humboldtpenguin.htm The more you know!!!