Stop touching the affected area and keep others away. Treat tingling or a shock around a sink appliance as a possible electrical fault requiring urgent qualified assessment, not as a normal disposer vibration.
What the observation tells you
Do not touch the surface again to confirm it, use a household object as a tester or handle wet plugs. Isolate only through a safe accessible control away from the suspected hazard. Seek medical help when an electric shock has caused injury or concerning symptoms.
A useful next step
Keep the appliance and affected area unused until assessed. Describe the contact point and any nearby water without making another test.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.