Why I was late for work

I was late for work this morning and the boss called me into his office.

"Why were you late?" he asked.

"I nearly choked to death," I replied.

"You nearly died?" he said.

"Yeah, it was my own silly fault though. I'm alright now."

"Well, in the circumstances I'll let you off with a warning. I hope you've learnt something from that though," he said sternly.

"Oh I have," I said "I've learnt you should never

Spoiler:

try to look up a girl's skirt on an escalator if you're wearing a tie."