get the bug

To become suddenly excited by or very interested in something (which is typically specified between "the" and "bug"). Molly's becoming really intense about the rehearsals for her school play. I guess she got the bug for acting! I got the travel bug when I was in college. Now I make a point of visiting at least five different countries each year. Claire got the Disney princess bug as soon as she saw Frozen. Now, she practically lives in her Elsa dress.