Just read this on the BBC Website:

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The alcon blue butterfly (Maculinea alcon) of central Europe has long been recognised as a great con artist.

Its caterpillar emits sounds and a chemical signal which essentially "instructs" worker ants to pick it up and carry it back to their nest, where it is fed, cleaned and cared for as if it were one of the queen ant's own brood.

The caterpillar can live for up to two years inside the nest before pupating into a chrysalis, from which a new butterfly emerges.

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How cool is that?

Sorry.  I'm easily amused!