yeah I see what youre saying.. I dunno about other dimensions and universes.. It would be awesome, though.. Like,

You: "damn, i'm all out of weed... wait, i know!!"

**Picks up the phone**

Phone: "Ring ring... ring ring"

You from an alternate dimension: "hello?"

You: "Hey man!! Its me, you, from an different dimension. how you doing? yea, good, anyway, im all out of weed, so if you can just......."

Phone: "Dial tone..."

You: "He hung up. Me from an alternate dimension sucks"

Okay, so maybe it wouldnt be so good