When is “ImgBurn lucky day”?

• Message on unlucky days "As Yoda would say, “Hmm, Failed in your attempt to outsmart me, you have.” ISO is not an apprpriate container format for the current disc and regardless of what you select for the file extension, I will not create a true (MODE1/2048)ISO image! The file will be created with a ‘.bin’ extension instead."

• Message on lucky days “As Yoda would say, "Hmm. Failed in your attempt to outsmart me, you have.
  ISO is not an appropriate container format for the current disc but today is your lucky day and I will make the necessary adjustments (convert MODE2/FORM1 to MODE1) if you want me to?
  If you don’t, the file will be created with a ‘bin’ extension instead.”

When is a lucky day?

@Lightning_UK