Are you going to heave or going to heaven?

I happened upon this scene today.  First I saw the question on the left and thought it unusual since it's very rare that anyone cares so much if you are going to heave that they will give you a test for it.  This is must be a new type of medical screening, I thought.

Then I rounded the corner and saw the full scene.  

Oh! this is about heaven, not heaving.  That is a different matter entirely.

Until today I never thought of these two words as having anything at all to to do with each other, but now, I must confess I can't help but think of it.   

What a difference a single letter can make.