A drunk guy just offered to pay for my groceries at the Superstore. For perspective, It was around 8pm, not prime drunk grocery shopping time, my husband was right there, I'm 36 weeks pregnant, and it was just over $100 worth of groceries. Obviously I said "no, thanks" to which he relied "are you sure... it wouldn't put a dent in it...", so I said "no, thanks" again.

What possible motivation would Drunk Guy have for trying to pay for stranger's groceries?

This is not weird on the "homeless guy trying to give me money" incident level, but still...