An apparatus for dispensing a carbonated beverage includes a sub-chamber that communicates with a main container. One or more hierarchical verification levels are used to verify whether a human face is in the candidate area, and an indication made that the candidate area includes a face if the one or more hierarchical verification levels verify that a human face is in the candidate area. A gate voltage is about equal to or greater than a breakdown voltage of the gate dielectric in order to break down the gate dielectric into a breakdown state.