You want to exercise extreme caution. As previous posters stated, this combo can cause some devastating inebriation and equally extreme lapses of judgment. For me, benzo's and alcohol have caused my only regrettable drug-induced behavior (like passing out mid-sentence and falling out of my chair with no warning during a family dinner).
The two drugs lend themselves to blind, crazed blackout adventures which you will not remember, so if you should try it, you'd be advised to do it in private for your first time, and start with SUB-active doses of both, a little goes a very, very long way.