Just that really.
DP and I are staying in a Hilton hotel for our anniversary this weekend. We met another couple in the bar last night and got to chatting, nothing amazingly in depth. Just the odd bit of small talk when we happened to pass each other.
We were heading to the pool today and the woman approached me in the changing room with her DD and asked if I could watch her in the pool as her and her DH had arranged to go sight seeing. She said her DD was below the minimum age to take responsibility for herself and needed an adult present.
I said no flat out. I'm not comfortable with children at all and was definitely not up for babysitting someone else's especially when I didn't know them. She huffed for a bit then apologised to her daughter because she couldn't go swimming.
Tonight she has approached my DP at the bar to ask if we can take her tomorrow and claimed that I had said it would be fine. 
Obviously the answer was still no. DP seems to think I'm being unreasonable though. To be fair I would question the judgment of anyone that would trust a stranger with their DC but that's just me.