There's a bit of ringing at about 70MHz. This is not unexpected unless your layout is really tight. A small amount of inductance in the wiring can cause this, in conjunction with stray capacitance.
For example, suppose you were using a solderless breadboard with 5pF of stray capacitance (WAG). The inductance required to resonate at 70MHz would be only 1uH which could be created by a wide open loop of wires.