What are some cool/funny seafaring songs to help wile away the time on a boat?

Yeah i’m going on a friends boat this weekend in the idyllic sun drenched North Sea…..yeah right!!! Now, I haven’t really got my sea legs, been a while as it happens. I reckon to help stave off any sea sickness I should sing out loud & proud as many songs as I can possibly think of. I’m Popeye the sailor man, A poirates loife for me, that Titanic shit…..my farts will go on, whatever. Anyway yeah, thought i’d ask for your help in this delicate yet crucial task. Got any boaty songs then?