1988 was a watershed year for explosion-laden, bullet-riddled action flicks. Chiseled body builder-types like Sylvester Stallone, Arnold Schwarzenegger, Dolph Lundgren and Carl Weathers racked up massive body counts in Rambo III, Red Heat, Red Scorpion and Action Jackson. But that year's best-remembered action film announced the age of over-grown muscle stars had passed. In Die Hard, Bruce Willis's John McClane was a different kind of action hero. He was an unstoppable killing machine audiences could relate to — a wise-cracking, barefoot beat cop who needed every lucky break he could catch. Flash forward 20 years, and the lasting effects of the Bruce Willis-ification of the action star are evident. The girlyman heroes appearing in this summer's event movies include fresh-faced art house stars, doughy comedians and AARP members. This summer, it seems, almost any Joe can be a hero.

Click here for more unlikely summer blockbuster heros.