Capital PUNishment.

Punning takes guts. Even the best pun is likely to elicit a groan .

It's the nature of the banal beast.  But it's also the beauty of it. Puns are the Mutts of the language litter.  Scrawny, pathetic little bundles of joy.  And I love em. Even the lame ones have charms to tickle a logophile's longing for loopy linguistics.
And it's really hard to think of one by trying.  They almost always just pop into your head prompted by a word in another context and then the instinctive associative process takes its own course.  And when that happens, it can be very re-wording. Add a visual and it can be...

The above is by someone as shamelessly (actually, he appears to be more so)

infatuated--he's Craig Swanson and a visual punster with the courage to explore the depths of the most shallow seas of sophomoric silliness. And when he finds something, he renders it with such craft and artistry--which makes it even funnier.  Many of his most inspired ones wouldn't work without the imagery. 

You can find  his cartoons and long personal stories/explanations to accompany them-- as well as other stuff at: 
http://content.perspicuity.com/?q=

And here's more:

O is For:

BY SPECIAL (Presidential) DELIVERY FROM ALEX M.-- Obambulate:   To walk around.  Wander. Obganiate:  To irritate someone by constantly repeating oneself. Ombrophobia:  Fear of rain Oneiric: Of, like or pertaining to dreams Opisthosomal: Of, like or pertaining to posteriors Oculoplania:  Letting one's eyes wander while assessing another's charms Ozostomia:  Bad breath

Onychophagy: The habit of fingernail biting