Call from the boss

My boss called me yesterday and said, "Where the hell are you?"

I said, "I'm relaxing in my garden with my mate Dave, I'm already on my 4th can of lager."

"I don't bl**dy believe you!" He shouted.

"Hang on," I said, holding the phone away from me,

Spoiler:

"Dave, isn't this my 4th can?"