Does any one else smell... Smoke?

Charter had been working on his copy work all day. He was almost done. He had an hour to finish. I was making cookies, so his time was going by in 10 minute chunks.
While the last pan of cookies was in the oven, Charter looks up from his work and thinks, "There is no way I can finish my work in only 5 minutes."
So, thinking he is quite clever, he sneeks over and adds 5 minutes to the timer. There, now he has 10 minutes to finish. He can do that.
The minutes drag by, and he looks up and again, thinks, "How in the world can I finish in only 3 minutes." So he sneaks over and adds another 10 minutes.
Again. "How can I finish? I need more than 1 minute!" He sneaks over, but I hear him this time.
"Charter! What are you doing? Are you adding more time so that you can finish before the timer is up? You can't add time to the timer! There are COOKIES in there!"
His face turnes white. He gasps.
"How much time did you add?"
"There was one minute on the timer when I came over here."
I turn the timer from 11 minutes back down to 1.
"But they would have been done my now."
Oh, really? You mean like 20 minutes ago?
As I open up the oven door, smoke billows out. I slowly remove a cookie sheet. Fanning the smoke away reveals a thin black sheet of what 20 minutes ago would have been quite yummy cookies.
He looks like he might be sorry.
"How many times did you add time?!"
"Umm, a couple?"
Yeah. I thought so...