@azizk got another great find (thanks!), this time it's a site called movieclips.com. Not too sure how this works copyright wise, but either way, it's a great resource for quick little acting clips. Great for reference, great for inspiration, great for audio clips, etc. It lets you even embed the clips and all kinds of other options. It's also cool that they different categories, like "most popular" and "iconic lines", two sections you should avoid in terms of using them as audio clips for your reel. :)
Very sweet, I hope it gets out of beta soon. Go check it out!