Marcia:
[
brushing her hair and counting] One, two, three, four...
[
noticing Greg undressing through the curtain]
Marcia:
...four, four, four...
Greg Brady:
Marcia?
Marcia:
[
seductively] Yes, Greg?
[
normal voice]
Marcia:
I mean, what?
Greg Brady:
If Roy really is Mom's husband, then does that mean...
Marcia:
...we're not brother and sister?
more