I will have sex with you, in the afterlife, but, I must still be loyal to maths and science

He bought the chocolate Galaxy minstrels from the cinema. That's the truth. Not from the local supermarket, near where he lives, but from the central town based cinema. 

To one more time reiterate. 

He bought the chocolate Galaxy minstrels from the cinema. 

On the way back from the cinema, he went to the local supermarket, and because he accidently lacked the forethought to leave his unopened bag of minstrels in the car, before entering the shop, it meant the awkwardness and inconvenience of his having had to argue with supermarket employees over his having a minstrels bag in his trouser pocket.

In the end, unfortunately, the man in question (the protagonist of this narrative) had to have the supermarket staff phone the cinema employees to confirm his identity - indeed, that he had been in the cinema that same day, and had been the one to buy the chocolate Galaxy bag.

A message to God:

I will have sex with you, in the afterlife, but, I must still be loyal to maths and science.