Heres a good one for the group... I once had a design that had an 0603 ceramic 1000 pF 25VDC capacitor in the return leg of an RF circuit operating at 50 Mhz. Some guy changed it to an 0402 50 volt cap because using an O-Scope across this node you can measure 20 VPP on one side of the cap. Turns out the cap is really a 25 volt 0402 and I am concerned that this will reduce the reliability of this part. After all, it is the RF return for this CKT. Comments?