Don't bother asking flight attendants for regular coffee on long flights. George Hobica of Airfarewatchdog.com did a list of "Things your flight attendant won't tell you" and one attendant said, "You know that coffee you ordered? It's actually decaf even though you asked for regular. We'd rather you sit back, relax and fall asleep so you don't bother us too much."
Other things on list include: