Reminds me of the time me and two others were in SQ F on the dayflight SIN-FRA. All were completely quiet the whole flight, at no point did anyone look drunk and I didn't feel drunk at any stage. I asked for another glass of Dom just before landing (I'd had a few Krugs & Doms, sipping through the whole flight) and was told: "I'm sorry sir. We're out of champagne. We took off with 8 bottles of Krug and 4 bottles of Dom and you three have a drunk it all".