Ok. I honestly don't know if this is a 'everybody knows this is what happens' scenario because I avoid sales like the plague and I am in fact unreasonable, or.. this is as odd as I think it is.
My boots broke on me yesterday, zip fell off..my feet were wet, they'd had their day. So I've been forced out into the shops with two toddlers. I researched online and picked a few from one store in order to minimise faff and toddler tantrums.
I went in . .tried them all and picked the ones most suitable. Not that I particularly liked them but needs must. rrp £89.99 Sale price £69.99 ..so we're talking twenty quid. It's a fair saving but not crazy huge..and while I know boots are expensive I still feel 70 is a fair amount of money to spend.
So I go to the till, I have a set- left shoe brand new from store room, and the right foot from the shelf, very worn.
He puts both in the box. I say something about it and he says 'no I've got the shelf one behind me' - ive got two kids demanding my attention and I shrug it off..pay and leave. Check box as still unsure and there it is, one raggedy old shoe and one smart new one. I go back in and he looks at me like im mad and says that you never get a new pair in the sale.
...'so I just paid 70 for one old, very worn stock shoe, and one brand new shoe?' 
'yes?'
'then I'll have a refund' 
I am SO confused. aibu and stupid?