"Funny" is an interesting English word when used to refer to humour, as there as so many types - from very subtle, often even cynical and sarcastic, to 'low comedy' (refers to bodily functions!) and all between. There is even 'black comedy' - not racial at all, but the sort of humour where one is not sure whether to throw up or laugh, or do both at the same time! And then there are the 'nonsense songs' - consider Spike Milligan: eg "The Ying Tong Song".

Often though, the more serious the performance (and the performer's attitude), the funnier the result. A lot results from the actual performance, and not just the content.