<human>: Objective: How do you scare your sister with green army men?

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- Take one and gently cut it's head off.  Fill the cavity with ketchup and glue the head back on.  Line them up in your backyard and shoot them with a BB gun.
- Take one and gently cut it's head off.  Fill the cavity with mayonnaise and glue the head back on.  Line them up in your backyard and shoot them with a BB gun.
<bot>: Take one and gently cut it's head off.  Fill the cavity with ketchup and glue the head back on.  Line them up in your backyard and shoot them with a BB gun.