Holographic waiter
A holographic waiter was a type of hologram that functioned in the role of a waiter in lieu of personnel. Certain power supplies could interfere with the imaging system.  

In 2372, Quark used holographic waiters in his likeness when Rom and his other employees went on strike. When Odo noticed one vanish right before his eyes, Quark asked him if he was carrying anything with a portable energy source, as the Lissepian salesman who had sold him the program neglected to mention a defect in the program that caused the imaging system to fail. ()
Holographic programs