Has anyone been in store when anyone famous has come in into a store that one is in shopping in?

Not a store specifically, but I used to place phone orders for an international company. Placed several orders for different shows. Outlander was the last one. My manager there placed the order for the bb gun in The Christmas Story.

Yes, backbin 98' Prince ( the late artist) had been in a Borders Book Store in Phoenix AZ I saw him and his then wife leaving the store w Very large Body Guards.

I walked out of a hotel as Dave Chappelle was walking in... that's the closest that I've been to that situation.