Well, this is weird. On Friday, Uber, the San Francisco–based on-demand car-service app, will launch a one-day test of a new service that summons ice cream trucks on demand. They’ll be testing it out in seven cities, including New York, Boston, San Francisco, and Chicago — the trucks will be available to customers who request them. How does this make sense? We don’t know. But Michael Pao, a general manager at Uber, seems to think that the app has other uses in the vehicle-summoning realm. “Tapping a button and having something show up is magical when it comes to transportation,” he tells the Times. “We feel it will be magical for other things too.” What other things? On-demand notaries? Also, didn’t Kozmo.com try something like this over a decade ago? We know how that turned out. [NYT, Earlier, Earlier]