What's all this about puns being the lowest form of wit?
YOU CAN GET TWO MESSAGES ACROSS FOR THE PRICE OF ONE
WITH A PUN!
All the same, it's a good idea to count up to ten and take cover before being tempted to commit a pun. Expect a guffaw and you'll probably be greeted with a groan.
Truth to tell, puns are most likely to be successful when they happen by accident. Best advice is just to watch out for puns and take advantage of them when they happen.
What are visual and verbal puns anyway? Puns say
two things in the space of one. Here are a few examples.
VERBAL PUN

Animated banner for a system to cure water sources of sulphur contamination. Afflicted wells smell of bad eggs.
SEMI VISUAL PUN
Semi-visual pun because its second meaning is a textual punctuation mark.

Space is often tight in a
strip cartoon.
VISUAL PUN

There's even a kind of visual pun in this icon graphic. The little white dots on the sunflower represent seeds. The spots do double duty as a highlight to give the centre of the flower a rounded look.
The best you can do is watch out for puns. ...And watch out when you've got them!