I just received a Gameboy Link Cable made by Wild Things, who seem to have a sense of humour, and who have given me permission to send you this info., as you'll see by the following taken from the instruction leaflet:
Do not use this product under the sea
Do not iron this unit
Do not let wild animals cat your Wild Things product
Your Wild Things product will not function if you drive a steam roller over it
This Wild Things unit is not a hat - do not wear it at state functions
A serious malfunction may occur if you hit this unit with a mallet
Do not use this product as a football
This unit is not a telecommunications device and will not accept incoming calls