With mine it is the clicking of their pens that drives me bonkers! I always threaten them with the good old fashioned kind where you pull off the cap!
Love this rule, and the name!! Only suggestion is to point out that the vowel must be right next to the floss letter. That's why this rule won't work in words like: girl, curl, golf, etc. One vowel, ending in l or f, but they aren't doubled, because the vowel isn't right next to the floss letter at the end.Less confusion later if they know this ahead of time.:)
Thanks for filling my bucket!