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You never realize how much you need a pen until you don\u2019t have one. Whether it\u2019s jotting down a million-dollar idea or catching someone\u2019s phone number before they lose interest, not having one is a real buzzkill. This keychain pen<\/a> fixes that problem forever.\u00a0<\/p>\n And get this: it writes with titanium, meaning it writes on any surface and is inkless, smudge-free, and capable of writing underwater \u2014\u00a0because you never know when a mermaid might give you her number. The ForeverPen\u2122<\/a>\u00a0is only $23.99 here (reg. $40).<\/p>\n With this 1-inch-long gadget on your keyring, you can do more than write. It\u2019s so durable that it can withstand fires, so you can use the keyring multi-tool<\/a> to open Amazon packages, mark wood surfaces, clean your nails, cut lightweight cords, and maybe even strike up a fire.<\/p>\n