Bonuses appear in some episodes of QI; they offer panellists unique opportunities to get extra points for completing certain tasks, or answering specific questions correctly.
A joker card is a special type of bonus: it applies to an entire series, and points are rewarded for using it when the answer to a question is related to a certain theme. The first episode to feature a joker card was "Engineering". The joker cards used so far have been:
- Elephant in the Room (E Series, for elephant)
- Nobody Knows (I Series, for ignorance)
- Spend a Penny (L Series, for lavatorial)