"Severus!"
He heard his master's voice and Apparated to the kitchen, the source of the sound. Voldemort had his wand raised against a Muggle toaster, muttering hexes.
"My Lord?" Snape asked. Voldemort jumped, somewhat surprised by Snape's quick and silent arrival. He scoffed haughtily and pointed at the toaster.
"This accursed device refuses to do as it promises," he said darkly.
Snape could hardly hold his laughter in as he asked, "And what, my Lord, has it promised to do?"
"Do you not know how a toaster works, Severus?" he snapped, glaring. He frowned, then his tone softened. "I wanted to make a Muggle breakfast..."
"My Lord, they use electricity; you must plug it in." Voldemort looked at his shoes, suddenly enthralled by a scuff on the toe.
"Yes, of course, Severus. I was merely testing you." He looked up and calmly plugged the toaster in. "Begone with you!"
Snape went back to what he was doing, snickering in the corridor on the way there. Moments later, elbow-deep in a fairly harmless potion, he heard a cry.
"Severus! This thrice-damned refrigerator...!"
