I had the best grandpa.
From Grandpa, I learned how to be frugal. When we would go to Sam's Club (partly for the groceries, mostly for the free samples), he would always buy us a big pop right when we got there. He always advised us to drink it fast so we could get a refill, and as we walked out the door, he would say with a wink,
"Save that cup so you can get a free one next time."