Without photographic evidence, it's hard to know if things such as aliens, Abraham Lincoln, or true love have ever existed. Package evidence of your own being for later generations to study with today's Groupon: for $15, you get $50 worth of photo books, cards, and more from Mixbook.

With Mixbook's photo-book services, you can instantly upload your treasured pictures and customize each with the easy-to-use Mixbook editor. Use the editor to crop photos, add text, and rotate any pictures, allowing you to convince friends you met Adam West while hanging upside-down in his master bedroom. Clients can then choose from several different types of printed books, such as the 8"x6" softcover pocket landscape ($11.99 for 20 pages) or the 14"x11" hardcover coffee-table book ($49.99 for 20 pages), ideal for stirring up jealousy in bookless coffee tables. Mixbook uses archival-quality silk paper to ensure sentimental snapshots have a glossy look and feel. Capture the moment the bride said "I do" with a professional-quality wedding picture book, or encapsulate baby's first word—"mitochondria"—with a baby memory book.

You can also utilize Mixbook's services to craft engaging, customizable cards and stationery ($0.39+ each). Create your own jovial holiday cards with the entire family in front of the fireplace or dainty wedding invitations with encoded messages about the real meaning of life.