You decide to visit your friend John. This'll get him good! What fun the two of you'll have!
Once at John's you ring the doorbell and wait with the box of vials under your arm. John opens the door, "Yes?"
"Hi, I'm Max, I'm a friend of Mary's. She said to meet here, that she had a surprise for you. Is she here yet?" Mary says and pushes her way into John's apartment, closing the door.
"Um...no...she isn't here," John stammers, bewildered.
"No matter," Mary says with her masculine voice, "I think we can start without her. Say, how about something to drink?" She sets down the box of vials and unlatches it.
"Um...sure..." John wanders dumbfounded to the kitchen to pour two drinks. Mary takes out a vial and hits the dial button on her cell phone calling John's apartment. He quickly puts the drinks down on the table and goes to answer it while Mary quickly puts a vial into one of the drinks.