...When you photoshop your face onto a formerly popular tv geek/nerd character after having dressed up as them for halloween, post it on facebook for laughs and then get into a legalese-type argument with your equally geek/nerd older brother about the relative geek/nerd quotient of committing such an act and whether it violates the George Lucas/Gene Roddenberry Accord of 1988 or whether the Carter/JMS/Wright Decision of 2001 is applicable*.
Bonus points if it then deteriorates into a debate over the literal, popular, or just plain fanciful definition of whether one is a "geek" or a "nerd" and just how much high school angst one must have been subject to in order to qualify for either label.
Honorary Mention for the utter dismissal of SG-1** for the inclusion of Ricky D and culminating in all of one's respective friends responding to said discussion with the arbitrary and completely frelled-up label "losers with nothing better to do" in regards to both parties.
*I won.

**Not me!