Here's an effective to make your friends feel guilty when they turn down offered foods:

Moi: Uy, kain ka pa o. *points at the cake*

Friend: Uhm, ok nako. *shakes head*

Moi: Alam mo, mapalad ka pa. Buti nga nakakatikim ka ng ganyan eh *points at cake again* Yung iba kasi, hindi. *sabay kanta ng...Nakaligo ka na ba sa dagat ng basura..*

Kung di ka ba naman makonsensya niyan! :P

This is child labor at its finest. Bleh!