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The when: Fridays, 10 pm/ET, NBCWhy watch?: Mike and Piper (James Lesure and Camille Guaty) bond with each other in a way neither could have imagined — or, as it turns out, can remember — in tonight's new episode of Las Vegas (10 pm/ET, NBC). Dispatched to a shady bar to surreptitiously recruit a hot bartender for the Montecito, the surveillance chief and the comely concierge try to blend in by having a few drinks. And then a few more. "[Mike and Piper] end up getting drunk and don't really remember anything," says series creator and executive producer Gary Scott Thompson. "Then a wedding video turns up and they see what they actually did!" Sounds awkward, to say the least — but how will this inadvertent union affect Piper's relationship with Cooper? "The audience has been dying to know more about those characters," says Thompson. What's next: "[Tonight] starts a string of episodes [in which] we discover more information: If they had a relationship or didn't have one,...