Your Druid is sneaking through the camp site and a few soldiers start walking towards her general direction.
Druid: Uhh, I turn into a tree.
DM: The camp you’re sneaking through is in the middle of an open field.
Druid: Shit. I’ll turn into a tree anyway.
Soldier: Hey, has that tree always been there?
Druid: I’ve been here for weeks.
DM: Roll to bluff.
Druid: Nat 20
Soldier: Well the tree would know better than us I suppose.