A pessimist is a person who has had to listen to too many optimists.
Don Marquis (July 29, 1878 - December 29, 1937) was a writer, poet, and artist; best known for creating the characters "Archy" and "Mehitabel". Archy was a cockroach who left poems on Marquis's typewriter by jumping on the keys, and Mehitabel was both a cat and a friend of Archy.
Silent but deadly
I'm male, taken
I'm female, say nothing