Vegetables are natural. Sometimes they look a little "too natural" as in "au naturel" for a human.
Carrots are usually fairly harmless. They tend to look like some type of a spear. However, plenty of carrots tend to take on more human features. Find an example at http://www.nerve.com/archived/blogs/would-you-put-this-anthropomorphic-carrot-in-your-mouth
Parsnips are also usually harmless. However, they like to take on certain "special" human characteristics at times, too. Find some examples of them here: http://www.buzzfeed.com/peggy/phallic-vegetables/gigantic_phallic_butternut_squash
Tomatoes don't seem to be a nasty vegetable (okay, fruit) at all. They are nice, round, and red. However, not all tomatoes like to conform to this idea. See an example of this here: http://www.funnydb.com/big_691218566202.jpg
There's always the joke that every lady needs a cucumber in her nightstand. Some cucumbers seem to take this too seriously and take on other characteristics. See an example of this here: http://stacysaysblog.blogspot.com/2010/07/phallic-vegetables-parents-dont-piss.html
This seems to be a bit tamer, but if you know how certain "downstairs" things appear, then you may not find it so tame. Find an example of this here: http://farm1.static.flickr.com/102/362893161_e8c96f4149.jpg
Hopefully this has made you laugh. Nothing offensive was meant to be mentioned in this article. Weird vegetable shapes are funny,
select one here...