... you design and build a robot control board and when you finally figure out why the damn thing won't work it means you have to go and build it all over again, but this time with those pullup resistors you forgot to include, or the external MCU crystal you thought you'd get away without using because the PIC chip you've employed just isn't quite stable enough without it and the worse thing is you've got another couple of boards sitting in the shed with exactly the same problems because you thought you'd save a bit of ammonium persulphate and etch a few of the boards on the gamble that you'd actually got the design perfect the first time, but didn't?
Well I do.
On the upside it's amazing what a bit of supa glue, the missing components and some flying leads can achieve.