Record it with your smartphone or computer (if your computer has a video camera, it has a built-in microphone), and eMail it to him/her, or play it back on a phone call.
You might want to use a second phone or a landline to make the call, then play it back with whatever you used to record it.
On your phone you are looking for a memo function or just use the video record as you would with a computer.
There are probably another five dozen ways to pull this off, but if you are asking you probably aren't all that savvy with technology and the above suggested method is pretty simple.
Even simpler is ask someone you know who is OK with this kind of stuff to come over and do it for you.