Until the fizz runs out

 The crack of the guarana can opening
Whoosh fizz whish and it enters the glass bubbling upward
Fizzing back down until there are only a few glass-hugging bubbles 
Waiting their turn to to float upward following the rest

To flow upward toward the surface and leave the drink flatter
With no bite and less flavor
Yes the extraverts leaving the party on cue
"To get air" They say, or "See a friend"

The essential flavor lingers still though
The guarana lolly like sweetness ricochets 
between tongue and cheek
carbonation died down before the glass has emptied