As a harmless joke, you changed your name in your sister's phone to "BF", thinking it could lead to a few laughs. When she sent this video to you the next day, you realised this prank may have more serious consequences...
"Radiation" has (M)ultiple meanings/uses, and not all radiation is bad. Non-ionizing radiation — radio waves, visible light, microwaves, etc. — is generally harmless
