Mercury Opposing Retrograde Uranus...

starts on October 2 (using a 1 degree orb), is exact on October 3 at 12.23am in Kilmore, leaves on October 3.  Mercury at 28 degrees and 10 minutes of Virgo, retrograde Uranus at 28 degrees and 10 minutes of Pisces.

A roller-coast ride is what I think of when I see this combination!  A lightning bolt too.... :).

It is important to keep a very open mind during this time because the information (Mercury) that comes our way is likely to be unexpected or be unusual (Uranus)... because of the involvement through the opposition aspect it is likely happen in a bit of a jarring way.  However, it is likely to help let go of outworn ways of thinking and to open up exciting new possibilities!

Mercury also represents our mind, so it may simply be that we come to a sudden realisation about a certain person or situation in our lives as represented by our birth chart. 

As usual look at where this aspect is falling in your birth chart to get a feel for what or who may be involved.  Look at which houses are ruled by Mercury (ones with Gemini or Virgo on the cusp) and Uranus (one with Aquarius on the cusp).

If you have personal planets and/or points in Virgo or Pisces then you may be especially sensitive to this transit.