Bar vs Pole

One morning my NLD son was telling a joke.

It started out by him saying, "Two thirsty guys walk into a pole..." 
I say "What? Two guys walk into a POLE????"

Luckily his 10 year old brother said "Do you mean a bar Eric?"

He replies "Yes, a bar."

I don't remember the punch line as I was still pondering the whole Pole
vs. Bar image. I still chuckle about it to myself. Luckily I had an
interpreter or I never would have made the connection.