Writer:	Steven Molaro, Stephen Engel, Bill Prady
Director:	Mark Cendrowski
Star:	Jim Parsons (Sheldon Cooper),  Kaley Cuoco (Penny),  Kunal Nayyar (Rajesh Koothrappali),  Simon Helberg (Howard Wolowitz),  Johnny Galecki (Leonard Hofstadter)
Guest Star:	Andrew Walker (Mike)

Aired in Venezuela on May the 13th, 2008 on Warner Channel Latin America (edit) This episode's end titles has Chuck Lorre's Vanity Card #206. (edit) Alternate Titles: The Nerdmabelia Scattering; The Hello Kitty Instability (edit)

Koothrappali: Too bad, I called dibs.
Wolowitz: You can't just call dibs.
Koothrappali: I can, and I did. Look up 'dibs' in Wikipedia.
Sheldon: Dibs does not apply in a bidding war. (edit) Sheldon: Why'd you set it for the day before yesterday?
Leonard: Because I want to go back and keep myself from getting a time machine.
Sheldon: You can't. If you were to prevent yourself from buying it in the past, you would not have it available in the present – travel back and stop yourself from buying it, ergo you would still have it. This is a classic rookie time travel mistake.
Leonard: Can I go back and prevent you from explaining that to me?
Sheldon: Same paradox—if you were to travel back in time and, say, knock me unconscious, you would not then have the conversation that irritated you, motivating you to go back and knock me unconscious.
Leonard: What if I knocked you unconscious right now? (edit) Leonard: Come on, guys, push!
Howard: If I push any harder I'm gonna give birth to my colon.
Raj: I can't feel my fingers. Hurry up!
Sheldon: It's the same amount of work no matter how fast you go—basic physics.
Raj: Sheldon, if my fingers ever work again, I've got a job for the middle one. (edit) Leonard: The elevator's been broken for two years.
Sheldon: I've been meaning to ask you. Do you think we should make a call about that?
Howard: Not necessary. I have a Masters in Engineering. I remotely repair satellites in a regular basis. I troubleshoot space shuttle payloads. When the Mars Rover started pulling to the left I performed a front-end alignment from 62 million miles away. (pushes the button of the broken elevator and then listens if it comes down) No, that baby's broken. (edit) Leonard: Girls like Penny never end up with guys who own time machines.
Sheldon: I disagree. Your inability to successfully woo Penny long predates your acquisition of the time machine. That failure clearly stands on its own.
Leonard: Thanks for pointing it out.
Sheldon: In addition, your premise is flawed. In the original film, Rod Taylor got Yvette Mimieux with that very time machine. In Back to the Future, Marty McFly got the opportunity to hook up with his extremely attractive young mother.
Leonard: Those are movies.
Sheldon: Of course they're movies. Were you expecting me to come up with an example involving a real-life time machine? That's absurd. (edit)

While suggesting the use of a cloaking device to use with the time machine, Sheldon refers to the the Star Trek episode "The Enterprise Incident", giving a date of January 10, 2328 as the pre-federation equvilant of stardate 5027.3 for the episode, but according to Star Trek Chronology: The History of the Future, the third season takes place in the year 2268. (edit) When Leonard gets out of the time machine prop he has socks on the entire time Penny is yelling at the guys till she leaves the room, then he has shoes on although he never moved. (edit)

As Leonard attempts to take his memorabilia away to sell, Sheldon grabs a toy sword, wields it, and blocks the stairway, declaring "None shall pass!", imitating the Black Knight's declaration to King Arthur when he tries to cross a small forest footbridge in Terry Gilliam's 1975 film Monty Python and the Holy Grail. (edit)