know what? still didn't work...

SQL> ALTER SYSTEM SET RECYCLEBIN = 'ON';

System altered.

SQL> create table tony (ssn number(9), name varchar2(6));

Table created.

SQL> drop table tony;

Table dropped.

SQL> SELECT object_name, original_name FROM recyclebin;

OBJECT_NAME ORIGINAL_NAME
------------------------------ --------------------------------
BIN$KijYSqTdCvTgRAAUTyMt/w==$0 LOGSTDBY$SKIP_SUPPORT

=====was expecting to see a reference to table TONY...

SQL> flashback table tony to before drop;
flashback table tony to before drop
*
ERROR at line 1:
ORA-38305: object not in RECYCLE BIN