Nearly finished fitting a brand new kitchen to our modest little abode. Whilst wifey measures the worktop I get ready preping the jig-saw, goggles etc. 5 mins later after wife measured & drawed the line where I was to cut, I commenced cutting. Just after I had finished cutting I heard wifey say the immortal words "Jay, I think you cut the wrong end" 
Me!!! I cut the wrong end!!!!! Who flipping measured it in the first place & told me to cut it????

Nah, my first mistake was lettin her measure it in the first bloomin place!!! 
By some absolute fluke the piece that was cut fits perfectly into the breakfast bar area that I've created. To be honest I couldn't have measured it more accurately. (not tellin her that though

easy mistake. i made a bay window yrs ago, 100mm too short on height. did another, exactly the same friggin size. these things happen but it usually costs to put ut right 

Once cut a hole for a round sink, sink fitted perfectly, about 0.5mm all the way round. 

Sink went straight to the bottom of the cupboard. Doh.