“Home Alone,” a beloved holiday classic, is basically a Looney Tunes cartoon come to life. But did it maybe give an entire generation unrealistic ideas of what kinds of injuries they could walk away from? This video gets a professional’s take on what sort of harm actually befalls Harry (Joe Pesci) and Marv (Daniel Stern) in the film “Home Alone” and “Home Alone 2: Lost in New York.” Just how many lives do they need to survive the double-feature? Quite a few, as it turns out. Follow Ned Ehrbar on Twitter: @nedrick