For me it would be the Sweden Rock '06 gig, where I met Jokkmokk for the first time.
But also the gig in Israel last year. Around the third or fourth song I started shouting shit in swedish, and Tom was first like: "What?" And then be went back to the mic and said something like: "There is this guy right here, he came all the way from Sweden." Around then I screamed 'til my voice popped!