Is the sea cold?

We were enjoying our family holiday last week when my 12-year-old son said, "I wonder if the sea is cold, dad?"

"You're just about to find out," I laughed, picking him up and throwing him in."

"I can't believe you just did that," screamed my wife, as she stared at me in complete shock.

"It's okay," I replied, "He can swim."

Spoiler:

"Where to Kev?? We're on a bl**dy cruise ship!"