Misplaced milk

Most of these things seem to be centred around shopping. Supermarkets are surprisingly interesting places.
The other day while gliding down the aisle, I stopped in front of the soft drinks. There on the shelf right in the front of the Coca Cola was a two litre bottle of trim milk.
What was going on here?
I'm sure we've all been guilty of putting back items, we were going to buy, in a different place in the supermarket. I was even caught once and told off by a not so friendly shelf stacking person.
But why was the milk left by the Coke? Did the person see Coke was on special and think let's buy that instead of milk?
Did they swap healthy trim milk for evil, junk, food Coca Cola?
Did they think two litres of soft drink was liquid so could fulfil the same role as milk but more cheaply? Will they have Coke on their cereal and in their coffee?
And how come they did not leave the milk on a refrigerated shelf?
Even i put like with like.