Routing or prioritizing Zendesk tickets based on mood / sentiment analysis

Ticket content can be parsed and analysed for sentiments or ticket moods using helpdeskapi.com. 
The data will then by stored within Zendesk in a custom dropdown field containing the following values:

• positive mood
• negative mood
• mixed mood

You could now set-up a Trigger in Zendesk to automatically set the priority to high, when the mood of your customer is "negative".