Coke Toll?

For the last couple of days every time I turn around my Coke has seemed lighter than I remember leaving it.  My husband isn't supposed to drink anything but water right now.  Now I am sitting here working on the laptop and I ask Randy to pass me my Coke.  He gets a glint in his eye and I know...  

I had to inform him that there is NO TOLL on my COKES!!!