The last sandboat (probably)

Me: "Look - while you were reading I built you a boat."
F: "Very nice, mum."
Me: "Where shall we sail to today?"
F: "I haven't finished my chapter."
Me: "But it's taken me ages to make it for you and I want to go sailing."
F (sighs): "You made it for you mum."
Me (huffing): "Well I'll just have to sail to Africa on my own then".
F (grudgingly getting into boat): "You do know I'm nineteen, mum."