[s12e15] - The Donation Oscillation

: Bernadette is terrified and tries to back out by claiming it's too dangerous for both parents of their children to be on the flight. When Howard offers to stay behind instead, she realizes he’s calling her bluff.

: Raj and Anu’s canceled bachelor party is repurposed into a group outing on a "Vomit Comet" (a weightless flight) for Raj, Anu, Howard, and Bernadette. [S12E15] The Donation Oscillation

: Although Penny initially said she was fine with it, she begins to have second thoughts. To prevent the donation—which requires Leonard to abstain from sex—she attempts to seduce him. : Bernadette is terrified and tries to back

: After Leonard declines, Sheldon expresses interest in donating his "superior" genetic material, but Amy immediately shuts him down. : Although Penny initially said she was fine

: During the episode, Wyatt reveals a "noodle incident" from Penny's past: she once drunkenly stole a horse in high school.