There can only be one...
This paperback cover is a classic expression of the value of wit in communications.
There is a time when everything should be literally spelled out and then there is something to be said for engaging the viewer in such a way as to make them a part of of the communication process. The greater the level of engagement, the higher the liklihood that the person reading the message will adopt it as their own. After all, they had to work to decode it.
The risk is that some folks won't be able to crack the code, but you can't please everybody - and the same risk is true for even the most blank, expressionless communications.