Single-shot event subscription

I'm fairly convinced that this isn't possible, but I'm going to ask nonetheless.

In order to make a single-shot subscription to events, I frequently find myself using this (self-invented) pattern:

EventHandler handler=null;
handler = (sender, e) =>
{
    SomeEvent -= handler;
    Initialize();
};
SomeEvent += handler;

It's quite a lot of boiler-plate, and it also makes Resharper whinge about modified closures. Is there a way of turning this pattern into an extension method or similar? A better way of doing it?

Ideally, I'd like something like:

SomeEvent.OneShot(handler)