What the heck?

What has 4 letters. Agreed

Sometimes has 9 letters. True

and

never has 5 letters.

pretty quick on the BA button, aren't you boy?

W-H-A-T ... that's 4 letters

N-E-V-E-R .... that's 5 letters

S-O-M-E-T-I-M-E-S .. that's 9 letters

So .. Yes .. your statement is correct !

.. and What the heck ? was your question !

Yep that's right.

Unless I have to spell them.

Detroit mail carrier.