Hi everybody.
Where does this phrase comes from? And why is it so often quoted?
"Domo aigato Mister Roboto"
Austin Powers sais it in "Goldmember"
Homer sais it in one of the "Simpsons" episodes
Seann William Scott sais it in the 2003 MTV "Matrix Reloaded Parody"
and many more...
So ... it has to be funny ... but I don't get it (perhaps because I'm German?

)
Please help me

Thanks in advance,
Stefan