I’ve seen message boards with nested quoting enabled.
Every post in the thread becomes a quoting of every post in the thread,
1
1[sub]2[/sub]
1[sub]2[sub]3[/sub][/sub]
1[sub]2[sub]3[sub]4[/sub][/sub][/sub]
1[sub]2[sub]3[sub]4[sub]5[/sub][/sub][/sub][/sub]
1[sub]2[sub]3[sub]4[sub]5[sub]6[/sub][/sub][/sub][/sub][/sub]
1[sub]2[sub]3[sub]4[sub]5[sub]6[sub]7[/sub][/sub][/sub][/sub][/sub][/sub]
etc.
It is better this way!
CMC fnord!