Warning: Whispering to the past is a delicate art. To avoid paradoxes, always wear a tin-foil hat.
For beginners, start with simple whispers, like "Hello, 19th century! Enjoy your toast!"
As you advance, try more complex whispers, like "I'm a time-traveling toaster, and I'm here to toast your socks!"
But be careful not to whisper too loudly, or you might attract unwanted attention from the timestream.
For extra tips, visit our sister site: Toadys Toaster Tips