jack-of- all-trades......and master of none. :lol:

Jack Astors......(name of a restaurant)

Jack the Ripper ( we all know this one?)

you don't know 'jack'.....(some use that term for saying one doesn't know much)

Jack-in- the box
Jack and Jill

Jack Rabbits
Happy Jack (song by The Who)

Flapjacks (pancakes)
Jack @$$

comes to mind oh ............wrong forum again

Image  
 Mutley

 Image
Jack-O-lantern
Cracker Jack  Yummy! :P  
Jack be nimble, Jack be quick, Jack don't jump over the Candlestick.

Little Jack Horner.

Jack all.
Car Jack

Hijack
Hi Jack,
U wouldnt say that on a plane. 
Jack and the bean stalk
scrummy wrote: Hi Jack,
U wouldnt say that on a plane. 


Yeah that's Freedom of Speech carried a little too far.....LOL
Jack be quick.....Jack jumped over the candlestick.....LOL ....oh yeah he left :)

jacket

Monterey Jack 

jackal

Jack Russell terrier 
opps that was my revise version

Jack be nimble, jack be quick, Jack don't jump over the candlestick, run to the store and buy twenty more. (revise version due to the rise of energy cost)

Car Jack

Jack Benny
Jack Frost
Jackanory Childrens TV UK
Jack Spratt
Car Jack
Jack of all trades
Jack Duckworth (Coronation Street)
Jack Charlton
Jack Tar