Dynamic fracture experiments on four bonded polymers using high-speed photography showed that different static sharp notches formed after the incident dynamic cracks met the material interfaces. In one scenario, an incident dynamic crack induced interfacial crack nucleation, and two convex notches formed after the interfacial crack propagated away. In another scenario, interface-induced crack kinking and a “head-to-tail” crack kinking pattern led to a concave notch with a singular stress field, which merits consideration in fracture mechanics modeling. In contrast, load-induced crack kinking did not cause the above scenarios. In another unique experimental phenomenon, a slightly curved/kinked dynamic crack only had a small local crack kinking angle, but its final crack direction was almost 90° to the initial crack direction over a long crack path.