Two heads, one body,
Tis one, t'aint one, be one soon.
Tis two, t'aint one, be two soon.
Tis three, t'aint one, be three soon...
That is a traditional rhyme for counting strands of yarn onto a niddy noddy, a simple tool used to wind yarn into skeins.
For instructions on using the niddy noddy see BellaOnline's Spinning Site