Fries and Milkshake!

Whenever I went into a McDonald's when I was younger I used to order fries and a vanilla milkshake and then dip the french fries in the milkshake. I never saw this as weird because it as soooo good! But as I grew older I started realize that it was kind of strange and I stopped doing it, however, not too long ago my parents were talking about reading somewhere about the "trend" of dipping fries in ice cream or milkshakes! Is this a thing people do? I can't remember how it taste because it's been so long but I feel like going to a McDonald's just to try!