Little Johnny climbs the ladder up to the att

Little Johnny climbs the ladder up to the attic for the first time. When he puts the light on, he sees the playpen he was placed in when he was a toddler. Excited, he rushes downstairs to the kitchen:
”Mummy! We’re getting a new baby!”
”What on earth makes you think that, Johnny?” says his mother.
”I’ve just been in the attic and Daddy’s already set the trap.”