For us, it's two 'mummy bunnies' who have babies that appear in their toy hutch (some weird mechanism where they drop down from the roof). They were mega reduced on Amazon last week so I bought one for each DD, even though it is really tat and I try to avoid tat mainly.
Well, the absolute amazement and joy when DD1 checked her hutch to find four babies in it. She's been playing with them for 30 mins now. DD2 about to be awoken from a nap and will see what she makes of it.
Anyone else had some surprise hits?