The Next day Penny and Sheldon are carrying paper sacks of groceries up the stairs to the 4th floor. After the frantic release of the night before there's a sated comfortable calm between them, occasional touches and small talk, eye contact and smiles.
On the landing of the 4th floor Penny frowns at the taped off Elevator
"Are they ever going to fix the elevator?"
"I doubt it. The car is firmly blast welded into the 4th floor framework and melted down into the 3rd floor structure. They'll need to dismantle the whole shaft to reconstruct it."
"Oh yes, Leonard said you saved them all from his rocket fuel accident. "
"Accident? Id hardly call making a bomb in the kitchen an accident. Leonard thought scaling down advanced rocket fuel would be as easy as cookery, just mix things together in the right proportions"
"but Leonard can't cook"
"as became painfully evident with his rocket fuel. Luckily his oxidant additions lowered the blast pressure of the Tovex gel or it would have damaged the whole buildings structural integrity."
"Did you really lie to Homeland Security for him?"
"No, I never lied. That would be a federal offense! I merely pointed out a known north Korean spy had been trying to steal Leonard's work and the blast had the signature of the experimental rocket fuel that someone could have tried to steal."
"So you mislead them without directly lying. smoothly done."
"Overall it was a good thing. I am fairly positive a lot of recent North Korean missile accidents are due to Leonard's unstable fuel formula. If he'd done it deliberately they should have given him a medal, as it is he's lucky they only revoked his security clearance." Sheldon laughs "You know, up until the moment he almost killed us all with the fuel I was wondering if he was a secret CIA Agent trying to keep tabs on my work. "