On 22 May, 2014, when the Welsh and the German National Quidditch teams faced off during the first round, German Seeker Thorsten Pfeffer attempted but failed to perform the Wronski Feint, and collided with the ground at a high speed. While his manager reassured the press of Pfeffer's likely full recovery, at the time, the injured German Seeker believed himself to be a budgerigar called Klaus.
- Harry Potter and the Chamber of Secrets (Mentioned only)
- Harry Potter and the Order of the Phoenix (Mentioned only)
- Pottermore (Mentioned only)
- Quidditch Through the Ages (2018 audio edition) (Mentioned only)