This return season of Curb has been a triumph for Larry David – each episode introduces wildly funny new conflicts, ideas and “rules.” This week’s rule may be embedded in the episode’s title: “Never Wait for Seconds!” And it continues the unexpected but very welcome addition of guest star Lauren Graham, as Larry’s latest romantic interest – a single mother with a son on the autism spectrum. It sounds like a dicey area for comedy, but already, last week, Larry David scored big with it.