An effective pun causes brain hemorrhage. Something akin to a stroke should occur. You should feel a distinct pain when observing a pun. A pain in the brain. If a pun is funny it is a failure. The proper response to an effective pun is the overwhelming urge the throttle the person who uttered it. If the hearer doesn’t feel murderous rage, at least momentarily, the failed punster should probably go back to flipping burgers for a living. Wordplay is not their forte.
This doesn’t mean you can’t enjoy punning; but it does mean that engaging in the practice places you solidly in the sadomasochistic realm, somewhere between schadenfreude and outright self-loathing. Torturing language in that fashion should be painful.