When eldest DGC was a toddler - and he's now nearly 15, taller than me, and loves outdoor activities - I can remember taking him out with DH along a country track when it had been raining, and saying to DH 'Why does he keep saying apple?' It took a long time, but I realised that was the closest he could get to saying 'Careful'. Not that it made any difference!
Can I use my bus pass on London buses?
Parents-in-Law. What do/did you call them?
Narrow miss. Bus and student on his mobile