What does this joke from that '70s show mean?

[Steph]

Two characters Hyde and Eric are at erics grandmothers funeral in Wisconsin, and the guy giving the speech about her life says "we all know she's in a better place now" and Hyde whispers to Eric "I'll tell you how to get to a better place, drive 50 miles in any direction" and Eric tells him to shut up.

So, what does this joke mean? Thanks!

 

[Harm]

It means they do not want to be at this funeral. They don't like their grandmother.

 

[MyNameIsSlimShady1]

I think it means to get away from the craziness.

 

[DebbieC]

it just means anywhere is better than where they are.

 

[MreA]

it means the grandmother wasn't such a good driver