The last time I spoke to Fats Waller
He asked me to lend him a dollar;
I think it was him
Though he looked rather slim
And was clearly no stranger to squalor.

In this episode of our Impostor Syndrome explorations it seems unlikely that the interlocutor is an impersonator, as his replications of the intended ‘impersonee’ are so slipshod. By the same criteria, however, it can scarcely be the real Fats Waller either, which leaves the reader in something of a quandary.