Yep I think at that age it's cause and effect so I was pretty lenient with DD.

But now she's had plenty of time to learn about cause and effect, so I'll stop dinner too because usually it's a sign that she's full. She's stopped doing that so much though and will instead try to put her bowl on the table (from her high chair) - that's her sign that she's finished.

It was pretty funny though when she'd throw food on the floor and then pat mine or DP's head when we were cleaning it up as if to say, "good daddy/mummy for cleaning up." Cheeky blighter!