"Right, what you do is... are you lot listening?"
"Yes sir!" came the eager replies. Lots of impressionable minds to mold today, better get on with it then.
"Right, then to create a Bag of Holding, that is bigger on the inside, what you do is," the wizard paused again with a sigh. "Yes Jenkins, what is it?" He nodded to the scruffy young man in the front row who was excitedly waving his hand up and down.
"Me mam's got one of those, sir! Keeps Imsie, that's me pet dragon, in it when she goes to coven. Them pixies don't get a right fright if they try to steal out of it whilst she's dancing windclad, when Imsie pops his head out and sees 'em off?" Jenkins smirked.
The thought of Mrs Jenkins doing nudies around the coven-fire caught the wizard off guard but he rallied quickly.
"Very good Jenkins. Pet caching is just one of the many uses for a Bag of, as I was about to demonstrate the fashioning of, Holding," he gently chided.
"Oh, sorry sir, please carry on," allowed Jenkins.
"I surely shall, with your kind permission," the wizard sarcastically rejoined as he held up a tatty old bag, about the size of a satchel, that looked like Jenkins' dragon might have been sick on it.
"The special thing about your ordinary, everyday mundane bag is, that it's bigger on the outside." He made a few semi-mystical waves of his hand across it, somehow to indicate that the dimensionality of this bag was in fact, exactly as you might expect. "Nobody seems to find that extraordinary, but it leads us to wonder, if we do this," and he deftly turned it inside out, "is it, we wonder, is it now bigger on the inside?"
Most of the class obediently oohed in amazement, but Jenkins just looked puzzled and scratched his head, dislodging a few tiny angry creatures that swore at him then flew off.
"Hang on," he ventured. "Now I know that in any event, when a right wizard such as yerself pulls a trick like that, the bag almost has to be bigger on the inside." He scowled. "Any fool knows that. But.." he trailed off.
"Yes, Jenkins? Would you like me to verify that it is bigger on the inside? Would you like that?" queried the wizard, with mock affront. "My word not good enough for you?"
"Well, yeah..." hesitated Jenkins, wondering if he'd gone too far, but not about to concede to what was obviously a bluff. His coterie (which he had started when his da said he couldn't have a gang) would have words to say about 'wusses' if he backed down now.
"Then step up here boy, and put your arm into the bag and just you see how big it is!" demanded the wizard, with a cruel smile.
Cripes, thought Jenkins. Now he was in for it. The wizard had doubled down! Who knew what nasties you'd find in a wizard's bag? Still, in for a penny... He stepped up and stuck out his hand for the bag. The wizard relinquished it, reluctantly impressed by the boy's brash courage. Jenkins was suddenly a bit taken aback. The wizard had given the bag up suspiciously easily. There must be something really boggin' in there. He felt like he was about to get schooled.
Jenkins gritted his teeth and thrust his arm into the bag and felt about. Suddenly his eyes widened in alarm and he almost jerked his hand out.
"It's all slimy and warm in here!" He tentatively felt about some more, with trepidation. Teeth, definitely teeth. And scales. And floppy ears. Wait a minute, he knew those ears!
"Imsie," he shouted and pulled out a tiny dragon no bigger than a Chihuahua. It panted and licked his hand. "How'd you get in there?"