When you see the phone number of the caller, and you recognize the number, think quickly for an answer other than "hello" that relates to the caller on the other end of the line. If you have a family of particularly spirited children, answer with, "Thank you for calling the Nut House." Relatives, especially older relatives, will get a kick out of you candor. Quote old movies that you know the caller is familiar with or quotations that share a special meaning between the two of you.
Gone are the days of having to call an operator to connect a phone call or dialing directory assistance for a telephone number. It is hard to forget the common phrases spoken by operators in days past. Answer the phone with, "What city please?" or "City and State." Wait for a response and repeat the question. The caller's confusion is sure to start you laughing, which in turn will cause the other person to laugh as well.
Laughter is actually contagious, according to researchers at University College London and Imperial College London. Studies confirm that you are compelled to smile and laugh simply by hearing the sound of laughter. Humans often mirror behavior when they are talking to someone. Answer the phone with a bout of hysterical laughter. Hysterical laughter will follow.