Amanita phalloides
Not much to look at in photos, but apparently they look really tasty in person. Ironically, people say they are very tasty, and then they get extremely sick with severe liver damage and other unpleasantness. 14 people got sickened in the Bay Area last December. 3 will need liver transplants. The article I read earlier today suggested that this one mushroom may account for 80% of people poisoned by misidentified mushrooms worldwide.
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"I find that the best way [to increase self-confidence] is to lie to yourself about who you are, what you've done, and where you're going." - Richard Ayoade