At last year’s Ecstatic Music Festival, Dan Deacon created a bit of a stir when, for 10 minutes, the audience listened to the sound of soda draining from microphoned two-liter bottles. Things got uncomfortable. Grievances were audibly uttered. Deacon likes to stretch things out, to see how far they’ll go, to make people a little uncomfortable. But his aim is true: He does it for fun, and he hopes you’ll see the humor and absurdity of his twisted ideas and find some joy in them.