Ounce upon a time there was a horse and a camel. The horse said to the camel, "Can you race me please?" The camel's answer was, "Yes. I will win. so I don't guess that you can win over me, but lets start," Laughed the camel. The camel said, "I have no idea how you might win this race over me." But the camel said to himself, "I will beat him by cheating." They started the race and the horse was a little ahead, but the camel bumped the horse. The horse fell down. The camel was close, but the horse get up and ran faster. And the horse won the race. 
Do not promise to do something that you cannot do and do not to say something that you cannot be responsible for. 