One wrong letter could make a major difference. This letter from a husband, to his wife back home, is the perfect example.
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A Minneapolis couple decided to go to Florida to thaw out during a particularly icy winter. They planned to stay at the same hotel where they spent their honeymoon 20 years earlier.

Because of hectic schedules, it was difficult to coordinate their travel plans. So, the husband left Minneapolis and flew to Florida on Thursday, with his wife flying down the following day.

The husband checked into the hotel. There was a computer in his room, so he decided to send an email to his wife. However, he accidentally left out one letter in her email address, and without realizing his error, sent the email.