Rolling in the annals

Acts of great stupidity, often go down in history
For those who always sensibly go on with life are dull.
If you would woo posterity, then you must cause hilarity,
For people have more sympathy with those who make ’em laugh.
So if a rule in clarity, you would seek – in charity
I tell you straight, ’tis jollity, that is the world’s mnemonic.