For some reason, coming up with mnemonics for Pi appears to be a hobby among some people. I've seen quite a few. Two selected favorites :

How I need a drink, alcoholic in nature, after the heavy lectures involving quantum mechanics.

and, this one attributed to Joseph Shipley...

But a time I spent wandering in bloomy night;
Yon tower, tinkling chimewise, loftily opportune.
Out, up, and together came sudden to Sunday rite,
The one solemnly off to correct plenilune.

And them there is the incredibly involved poem, 'Poe, E.: Near a Raven', which deserves a node all to itself.