Fridge / The History of Time Travel

Fridge Horror: Richard Page time travels back to the 1920s to inoculate his then-infant mother for polio, more than 30 years before the inoculation was invented, to prevent her death from the disease. His mother has recurring nightmares about a strange man jabbing her with needles for the rest of her life, prompting a lifetime of mental health issues that led to her suicide in at least one timeline. Richard really didn't think this through, or he would have at least brought the oral vaccine (administered via sugar cube) rather than the injection instead.