When you're having sex, entering from behind (e.g. doggystyle
,) about to come, you tell the receiver, "I'm about to come!"
Pull out and spit on her (or his) back while grunting. when she turns around, blow your wad in her face and yell, "April Fool's, bitch!"
you should've seen the look on her face when i said, "April Fool's, bitch." she was so mad.