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If your trace is short, the ringing is probably caused by your test setup (like a scope probe with a 6" ground lead.
The PIC probably doesn't "see" that -2V signal. Even if it did, the body diode (on the input of the pin) would clamp it to a diode drop below GND.
Charles Linquist
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Also, to avoid false readings and weird behavior of the switch a pause should always be set after a ground is detected (if a pullup resistor is used). This pause is for debouncing the switch and to let the ringing pass. In an 'ideal' switch you wouldn't need this debouncing pause period, but a real world switch will mechanically oscillate and act strange.
Robert
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