Fitting a new kitchen sink, I reminded myself that the waste isn't yet connected, to avoid the classic "pour water down sink, what's that splashing sound in the cupboard" error. To make doubly sure I put a criss cross of masking tape over the sink.
Fast forward thirty minutes. I notice I'd knocked a cup of water over on the New! Shiny! worktop, so I grabbed a cloth to mop it up with. Squeezed the cloth out in the sink, obvs. See error noted above.