So, a string walks into a bar and says:
"Bartender, how 'bout a beer." 

The Bartender looks at the string and says: "I can't give you a beer, you're a string."

So the string sadly leaves the bar.

The string walks into another  bar and says:
"Beertender, beer here!" 

The Bartender looks at the string and says: "I can't give you a beer, you're a string."

So the string dejectedly leaves the bar.

The string walks into a third  bar and says:
"Bartender, my good man, one beer please." 

The Bartender looks at the string and says: "I can't give you a beer, you're a string."

The string goes into a frenzy, twisting and turning every which way...then says..."'Fraid not!"