Einstein so your theorem says
TIme travel simple won't work
For if you travelled back and killed your dad
He can't meet mum and *** be had
The moment you struck you'd disappear
Or never exist at all it seems
Your peers say you can't meet yourself
As if you touch you interfere
Once again I think your wrong
As the body degenerates and its cells replace
In twenty five years the bones as well
I visit myself as I child it isn't me I won't explode
I just need a machine to prove the point

Oi  K9 where have you parked the Tardis