Tom is a nervous and forgetful husband. One day, coming back from his office, he recalled that his wife wanted him to send her letter on his way to work that morning. After examining his suitcase, he found no letter in it. Thus, he complacently told his wife, "Honey, I have sent your letter off. I am not forgetful, like I used to be."
"Sorry, my darling, the letter is still on the desk. I forgot to give it to you this morning." his wife said.