I was visiting another school as an ambassador of my CCA.Since i
was hungry, i decided to have my lunch there.Having bought my bowl
of minced meat noodles(extra meat of course
), i sat on a bench.
As i was stirring the sauce with my chopsticks, a bunch of rowdy
students came.The dominant one insisted that i was sitting on their
space.I said that it was all right if they sat with me, i do not
mind.However, they kept talking to me in a manner that they wanted
me to leave.One of them gave a stupid justification like they have
sat there for 2 years or some nonsense.
I used the same stupid theory against them and said:"If my
grandmother is the oldest person in Singapore, does she own
Singapore." 
They kept quiet, sat down and ate their food.