We do so so so many of these.
Reference to the moon gets the response full moon /half moon /total eclipse (Jaffa cakes).
Reference to getting a fork is fork handles/handles for forks (2 Ronnies). I have trained my children that it is a legal requirement to say this.
The answer to 'there's no pleasing some people' is always 'that's what Jesus said sir' (life of Brian).
'Haircut!' after a haircut (obviously) (Mary Whitehouse Experience). Likewise 'new shoes?!' (Clarkes ad I think?) when you have new shoes.
Putting something in a bag gets 'she'll put the bag in the bag but she won't put the bag in the book' (little Britain).
Proper reply to someone wanting a specific colour of something is 'the white one??', sometimes followed by 'I'll wash it meself' (persil ad).
And these are both now sadly mostly defunct but discussion of watching or making a video gets 'have we got a video??' and a phone ringing gets 'answer the phone Neil' (both from the Young Ones).
DD is taking sociology A level from September which has caused a recent resurgence in use of 'you got an ology?', and pre GCSE results nerves gave opportunity for 'Anthony! People will always need plates!'(BT ad). She is strangely unappreciative of these though.