NBC Washington Oh, you crazy kids! With your milkshakes and your singing groups and your flash mobs and your... marriage proposals? Yep. Ashley was just waitin' for her shake at Spike Mendelsohn's GoodStuff Eatery, but what she didn't know was that the other customers and even a couple of, erm, "employees," were actually members of Capital Hearings, a local a cappella group, Famous D.C. reported. By Carissa DiMargo Oh, you crazy kids! With your milkshakes and your singing groups and your flash mobs and your... marriage proposals? Yep. Ashley was just waitin' for her shake at Spike Mendelsohn's GoodStuff Eatery, but what she didn't know was that the other customers and even a couple of, erm, "employees," were actually members of Capital Hearings, a local a cappella group, Famous D.C. reported. When they burst into song -- yes, even the guy polishing a bannister with Windex! -- Ashley kept glancing at her boyfriend Jonathan.The group was singing their favorite song, and Jonathan was wiping tears from his eyes. Just guess what happened next. Guess like we didn't already tell you in the headline. You guessed? Great job!