Shots are part of a drinking culture but the word is ambiguous, also referencing the shooting by gun and shooting up.

Toucans were an advertising ‘icon’ for Guinness.

I couldn’t see a Guinness and not envisage a nun; a gun,
a finger and a thumb; midges, blether, scribble, scrum.

I couldn’t ….pass a nun
Without calling to mind
a pint of one, stout,
Untouched, on a bar
at the Angelus.

From ‘The Bees’ by Carol Ann Duffy