A French friend of mine who worked for Air France Cargo in Mexico told me the following anecdote.

"When I started working, my boss told me: "Boy, there is a phrase that summarises what it is like to do business here: "Seguro mañana te pago" (loosely translated to "I'll pay you tomorrow for sure").  Once you understand these four words separately and what they mean together, you'll understand what it is like to work here"."

I couldn't stop laughing, not only at the phrase, but at the fact that it's actually very true and shows quite a few things of the typical Mexican psyque.