Clearing the input buffer before a read.

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I have an sh script that asks the user a question and reads
the answer into a variable in the usual method.  I want to
be able to flush the input buffer just before the read so
that any slips or double key bounces get ignored, rather than
used as the answer.  I realize this disables type ahead, but
I can live with that.  Anyone know how to do this?

Thanx,
-- 
Ken Spagnolo - Systems Programmer, Postmaster, Usenet Administrator, etc.
   Computer Centre, Massey University, Palmerston North, New Zealand
K.Spagnolo at massey.ac.nz  Phone: +64-63-69099 x8587  New Zealand = GMT+12