Guilty of the above 100s and 100s of times.
When I collected singles if I know the record I never played the other side.
If I had got a lot of records I did not know I would play both sides (soul packs, bulk buys etc)
A classic eg = "Gonna wipe away the teardrops" when I 1st heard it out, went to the stage to see what it was.
I couldn't belive it was the other side of "The day my heart stood still" by Ollie Jackson.
I am even worse with CDs, last year after doing some decorating Lou counted 147 CDs still unwraped.
She was not best pleased, give me a earbashing why do you keep buying, you don't need them etc.
There's more now. lol.