Fred and Larry got married in New York. They couldn't afford a honeymoon, so went go back to Fred's Mum and Dad's house for their first married night together.
In the morning, Johnny, Fred's little brother, gets up and has his breakfast. As he is going out of the door to go to school, he asks his mum if Fred and Larry are up yet. She replies, 'No'. Johnny asks, 'Do you know what I think?' His mum replies, 'I don't want to hear what you think! Just go to school.'
Johnny comes home for lunch and asks his mum, 'Are Fred and Larry up yet?' She replies, 'No.' Johnny says, 'Do you know what I think?' His mum replies, 'Never mind what you think! Eat your lunch and go back to school '
After school, Johnny comes home and asks again, 'Are Fred and Larry up yet?' His mum says, 'No.' He asks, 'Do you know what I think?'
His mum replies, 'OK, now tell me what you think.'
He says, 'Last night Fred came to my room asking for the Vaseline and I think I gave him my airplane glue.'