I'm helping a friend who is carering to a group of businesspeople at their company-organised yearly get-together. For him it's a gig he is hoping will become a regular thing and a relatively reliable income some day. For me it's mostly cleaning glasses between refills. For a while, that is all my friend and I were doing: cleaning, rinsing. We took turns. At one point this guy comes up to us to let us know that his drink tasted a bit like dishsoap. He was nice and really just wanted to let us know so we can be more careful in the future if necessary. I don't see a reason for him to lie or exagerate. And he was sure that's what the taste was. It makes sense, too. We were hurring a bit sometime because there weren't that many glasses, a residue of dishsoap would be invisible but ruin the taste of the drink. But, for some reason or not, I defaulted on "But I'm not aware of me or us doing anything wrong." I didn't quite put it into those words. But my hesitant reply must have conveyed that that was how I felt about the "unterstellung". My friend was (and still is, successfully) more customer-aware than me, thanked the guy and assured him that it won't happen again. Guy was happy, friend was mad (today I think at me; back then I thought at the guy). And my stupid non-committing and abweisende reply is what I think of nearly every time I wash any dishes by hand, which since my dishwasher broke a few years ago, is a lot. I don't think I will ever either get rid of that memory or figure out how remembering it might still help me.