Underestimate!!
Few of my team mates and I went to eat Arabic Rice, rice were good, but one of my mate, wanted to have "Kahwa", which is kind of a Arabic tea, well he spent more than 15 minutes just to make understand the waiter about that tea he wanted, he called it with many names, but the waiter couldn't understand him, after too much effort my friends gave up, I kept the hand on the waiters shoulder and asked him "Tea" LOL, you got to see the faces of my friends as the waiter understood it. Funny thing is my friends underestimated the waiters English. It made me laugh so hard that tears came out of my eyes.
Never underestimate anyone else you will only waste your own time :).