A 3-year-old boy

[wildwood]

was examined his testicles while taking a bath.
'Mum' , he asked , 'Are these my brains?'
'Not yet , ' she replied.

[beejay1124]

definitely worth a snigger ,wildwood

[BillySugger]

Not bad but I think I heard it before http://www.theanswerbank.co.uk/Phrases-and-Say ings/Jokes/Question641597.html

[velvet lady]

its a repeate joke cos no one laughed the first time