In the cold opening to last night’s Late Show with David Letterman, an awkward green-room encounter between the host and guest, Justin Bieber, culminated with the teenage sensation sheepishly admitting to Dave’s suspicion when he said, “Yeah — you have no idea who I am, do you?” It was a funny bit that took advantage of the generation(s) gap between the two, allowing Letterman to get away with later asking, “Do you use the Twitter device?” The Twitter device? At least he didn’t go on to describe the internet as a series of tubes.

Bieber was a charming, helpful guest, boosting Letterman’s online profile with a tweet announcing to his nearly 7 million followers that he was hanging out with his boy, Dave. Give a look.

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