I can repro this in VFP8SP1 where it works as you expect it, and how it has changed in VFP9. I am not sure though I would expect the value you do in VFP9, but I do see your point. I modified your code to do the actual repro:

local oevent, ohandler
oevent = CREATEOBJECT([cntevent])
ohandler = CREATEOBJECT([cnthandler])
BINDEVENT(oevent,[dothisthing],ohandler,[dothisthing],1)

? oevent.dothisthing()

*-- Class:        cntevent
*-- ParentClass:  container
*-- BaseClass:    container
*-- Time Stamp:   12/22/04 08:50:04 PM

DEFINE CLASS cntevent AS container
       Name = "cntevent"

       PROCEDURE dothisthing
          LPARAMETERS tcThing
       ENDPROC
ENDDEFINE

*-- Class:        cnthandler
*-- ParentClass:  container
*-- BaseClass:    container
*-- Time Stamp:   12/22/04 08:51:12 PM

DEFINE CLASS cnthandler AS container
       PROCEDURE dothisthing
          LPARAMETERS tcThing
          RETURN .F.
       ENDPROC
ENDDEFINE