One glass of pineapple flavoured air please

Warning: bizarre rant (and first world problem) follows

There's an alarming trend in cafes - especially more expensive ones - to serve juices 'frothed'. In Sydney last week I ordered a glass of pineapple juice, at a cost of $4. When it turned up, not only was it about one third ice, the juice had been blended/whisked/whateverthehelltheydowithit within an inch of its life. I reckon I got about a tablespoon of pineapple juice in total.

If people like that, fine. But can I at least ask for some truth in advertising? Rather than

Pineapple Juice                                   $4

on the menu, how about something more accurate, such as

Pineapple burp (with ice)                    $4, sucker