There's nothing wrong with having the same word serve as both a noun and a verb.  When we take a walk, we walk; when we use the phone to call people, we phone them; when we apply paint to something, we paint it.  However, some nouns are not meant to be used as verbs (dare I say that they shouldn't be "verbed"?), especially when we already have verbs that express the same idea – and often are more precise.

Let's take one of the most offensive of the lot – the verb to incent, which appears in such statements as, "We must incent people ro work harder."  This back-formation from the noun incentive is unnecessary and (though this is admittedly an aesthetic judgment) ugly.  We have many more specific words that may be used, depending on context:  motivate, urge, persuade, encourage, convince, move, cause, induce, stimulate, prompt, induce, prevail upon, and others.  Worse yet is the polysyllabic jargon of incentivize, the use of which marks the speaker or writer as someone who values needless complexity above clarity.

When we asked for examples of "verbed" nouns on our message board, one person suggested such atrocities as "I'm going to suicide if she doesn't go out with me again," "I'll feel better after I enema it all out," and "Robin Williams guested on Letterman's show."  Another objected to the use of breakfast as a verb, as in, "Most mornings Thomas Judge is to be seen breakfasting heavy-hitters at the Wolseley in Piccadilly."  (It isn't clear whether he was eating the heavy hitters for breakfast or was having breakfast with them.)

Striking a particularly respondent chord, one participant noted:  "It seems that the inappropriate use of impact and impact on as verbs, especially by broadcasters – who should know better – has been around well past the period of mere trendiness. Whatever happened to the verbs affect and influence?"  Indeed, we can remember a time when impacted was used mainly to refer to a tooth that was blocked from breaking through the gum.

I happen to dislike the use of headquarters as a verb, as in, "Microsoft is headquartered in . . . ." versus "Microsoft has headquarters in . . . ."

When did people stop writing books and start "authoring" them?  Yet I read that so-and-so has authored a new novel or that so-and-so will author the screenplay for a film.  Is there some subtle difference between authoring and writing that I missed?

Who can excuse the use of effort as a verb, as in, "She efforted to overcome many difficulties in here life"?

And then there's this instruction from a teacher:  "Action the following words into at least five paradigms and justify the actions."  Hey, teacher – forget about the "paradigms"; I don't know how to "action" anything.  Maybe I could effort to author an essay instead.