So with breakfast I have just finished the last of the milk which is by now 2 days past it's best before date.  Because it is "so old" I smelt it first, it smelt OK so I sipped it and tasted that sip.  Again I thought it was OK.
But 
PARANOIA, my nose and taste buds no longer work properly, I hope it 
WAS OK 
Well I got a MOS to check out the bits in the bottom of the bowl and he thought it was OK too.