the art of remembering an arousing occurrence or some porn you watched while masturbating, often handy if you have no porn or your in the shower

While getting a blow-job, you show no inclination you're about to cum - then "suprise attack"- you cum in her mouth.

To wake up an unsuspecting person by inserting one's penis in to the victims anus or mouth. (Multiple points of entry through the use marital aids or phallic vegetables are acceptable and encouraged... (Obvious for female aggressors))

masturbating them ejaculating and the cum pooling in your belly button

While engaging in doggy style sex, the man pulls out and spits on the girls back, making her think that he has ejaculated. When she turns around he proceeds to ejaculate on her face in sneak attack fashion.

When you jerk off and come in your belly button.