Sounds like you once hit a pair of rabbits while they were mating... It's just their ghosts, attached to the scene of the crime.
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SilverBullet75
Formerly: '01 Ebony VXSTLTH
Now: '08 Saab 9-7x Aero 6.0L
I get a tap like that every now and then. Mine is like someone has a hammer and hits the floorboard from underneath. Not hard, just enough to let me know. It's not a constant thing. The first couple of times, I investigated, and found nothing either. So I quit looking.