Another "Daftar" gem

We have a water cooler in our office, the kind that takes in one of
those 20-liter bottles. In the morning, I was filling up my water
bottle with water as he stood behind me. I finished filling mine and
he filled him, and then took a sip of water from his bottle. "It's not
cold. I don't think the cooler is working." "No," I explained, "I just
filled my bottle so all the cold water is probably gone. It'll take a
while for it to cool some more water." "No, no, I don't think it's
working." He'd drawn a conclusion from his data and he wasn't going to
be corrected. I wanted to give him my bottle to show him that the
cooler was working, but I didn't want his brain to blow a fuse from
the contradiction.