Cucaracha (Cucaracha - a big black American with big moustaches and a squid) - so in Mexico the peasants called the government troops for the external resemblance of the shape and the habit of cowardly running, for the fact that instead of the proper protection of the people sold to the feudals and helped them the people to oppress, rob and steal for sale.
Then there appeared a song-blowing "Kukaracha", in it there were similar words: "Tarakana without legs can not crawl" and the like.
Later, the song became one of the unofficial anthems of resistance.
And even now, having a similar motif in the vicinity of a Mexican police officer or military, you can not be illusory "catch".