Yes "one day lad, allll this wil be yours" does come from monty python and the holy grail.
Other great quotes from that film include:
"your mother was a hamster, and your father smelt of elderberries!"
"we waaaant.............a SHRUBERRY"
"Your marrying princess lucky, so you better get used to the idea!"
Hmmm, other quotes:
"How do you know something bad isnt going to happen?" "I dont!"
"got lost in his own museum, eh?"
can u guess these?