Hello!
As soon I saw this one, I remembered when 7 years ago I used to start my scrum sessions with the following phrase
– Is yellow as a duck, swims like a duck, walks like a duck and uses batteries
You have to know the work of James Withcomb Riley to know the context, but if you loosen a little imagination it is enough.
As always great friends of Geek and Poke
Greetings @ Home
/El Brunon
Source: http://geek-and-poke.com/geekandpoke/2014/10/26/duck-typing-dogfooding
El Bruno 
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