Starting about a year or two ago, my wife (let's call her Sally) has been rather dishonest about some of the activities we've been apart of. Most of the time I don't notice, but my friend notices far more frequently. I would just like to preface this that our marriage is going good and there have been no problems with it.
The other week, my company invited spouses for an after work party. Without going into much detail, the first thing Sally did was fill up her bag (and the zip locks she tucked away) with various nuts and sweets. I noticed this when she kept packing me lunch with the same sweets/nuts as the party a month later. Most recently, Sally found out that a vary popular water park lets readmission if you have one of those temporary tattoos. Since we go a lot (at least 2-3 times a week during season), Sally came up with this plan where she would get a real tattoo that greatly resembles the temporary tattoo. Sally is currently in the process of "observing" each weeks tattoo. She has loads of notes about them, which leads me to believe that she's actually serious.
How can I talk to her and stop these minor schemes?