Ask for water, the waiting time can be measured in seconds.

Yeah, I've also noticed it takes ages for them to serve tea/coffee. Not that I care, I don't drink the stuff. On a flight the other week they had only a handful of pax in ten rows of Plus (including a guy the purser chucked out because his boarding card was for row 20-something), but that did not result in Go pax being served any sooner.

Johan