The T-shirt offer of the day over at Teefury today is a Spock, Paper, Scissors tee, inspired by the popular episode “The Lizard-Spock Expansion” of the CBS sitcom Big Bang Theory.

The limited edition blue t-shirt, available in both men’s (slate blue) and women’s (powder blue) sizes, sells for just $9 but will be sold today only — after that, it’s gone forever (at the top right corner of the site, there’s a countdown to sell-out time). Shipping is $2 for most residents of the U.S., but international shipping is also offered for additional costs.

If you’ve see the episode this shirt was based on, you’ll totally get the joke and see how totally cool this shirt is! I wrote all about this Big Bang Theory episode back in late 2008 [Read Video: ‘Big Bang Theory’ The Lizard-Spock Expansion] where the Sheldon introduces his friends to the game of “Rock, Paper, Scissors, Lizard, Spock,” a play on Rock, Paper, Scissors. The problem is, everyone kept picking Spock (no surprise).

Check out a clip from the episode here below to see what inspired the t-shirt. And remember, the tee is available today only, then it’s gone, so get in on it now!

Video

[Sheldon introduces Raj to "Rock, Paper, Scissors, Lizard, Spock"]

[Somewhat annoying CBS clip with numerous rounds of "Rock, Paper, Scissors, Lizard, Spock"]

[Thanks to /Film for introducing me to Teefury last year with their post about this crazy shirt.]