I would also suggest, if you happen to be in a Wendy's where Girl Scouts are cookie-boothing, buying a box of Thin Mints and ... I did not forget about the fry test. Although not initially ...

Wendy's: Why only celebrate French fries on one day when you could celebrate the whole week? From July 11-15, the fast food chain is offering a different fry freebie with mobile order purchases.