"The Conference Valuation"

On The Big Bang Theory Season 12 Episode 17, with Wolowitz watching the kids, Sheldon finds a book on experimenting on kids, and the gang makes a day of it.

"The D & D Vortex"

On The Big Bang Theory Season 12 Episode 16, the gang uses deception and betrayal to get the one open seat at Wil Wheaton's Celebrity Dungeons and Dragons game.

"The Donation Oscillation"

On The Big Bang Theory Season 12 Episode 15, Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend and his wife.

"The Meteorite Manifestation"

On The Big Bang Theory Season 12 Episode 14, Leonard is disappointed when he's excluded from a project and Bernadette and Wolowitz may be breaking the law.

"The Confirmation Polarization"

On The Big Bang Theory Season 12 Episode 13, Sheldon and Amy's super asymmetry theory is proven by two physicists who try to kick Amy off the Nobel nomination.

"The Propagation Proposition"

On The Big Bang Theory Season 12 Episode 12, Koothrappali tries to mend things with his ex-fiancée, Anu and Penny's ex-boyfriend, Zack, asks for Leonard's help.

"The Paintball Scattering"

On The Big Bang Theory Season 12 Episode 11, Penny and Leonard organize a paintball game that results in mayhem while Sheldon is jealous of Amy.

"The VCR Illumination"

On The Big Bang Theory Season 12 Episode 10, Bernadette helps Wolowitz ace his Magic Castle audition and Sheldon finds a VHS tape from his past.

"The Citation Negation"

On The Big Bang Theory Season 12 Episode 9, Sheldon and Amy are devastated after learning that Super-Asymmetry has already been discovered and disproven.

"The Consummation Deviation"

On The Big Bang Theory Season 12 Episode 8, when Wolowitz lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond Amy's mother.

TBBT Quotes

Engineering, where the semi-skilled laborers execute the vision of those who think and dream

Sheldon

Leonard: Hi. I'm Leonard. You are beautiful. You pop, sparkle and buzz electric. I'm going to pick you up at eight, show you a night you will never forget.
Raj: Where are we going?