Here's one of the oddest:
In the village of Bilston, near Twycross, stands what's left of a gibbet erected in the 1790s to display the executed remains of a ruffian who'd murdered his wife by throwing her in the mill race and tried- but failed- to kill his step-daughter the same way. A modern visitor to the gibbet arrived to find a woman standing there admiring it and a little girl running round. She nodded to the woman- who ignored her- and then did what she'd come to do and took some photographs. Later when she came to review the results she was surprised to find that neither the woman nor the child appeared in any of the pictures. And then she remembered a detail that her memory had suppressed- that both of them had been soaking wet.