I say be a smartass about it. Go back there, and say something like:"What, you can't call me?!" With a smile. If he lost your number, fucked up when plugging it in, etc. he'll get flustered, and you're in for the rest fo the evening. If he consciously didn't call you, coz' he's a jackass, then he'll definitely be embarassed...I think... just my 0.2$