Help and Advice

Hi,
As you all may know ive been wanting a new aquarium, but my parents won;t let me , and they said find a new hobby, so for a joke and i actually am slightly interested in it before, i said, what about a dirtbike and race around our garden ( 1acre) exspecting my dad to say no, then bam, my dad actually said yes,and said he was about to suggest that to me, Then we sat there researching into bikes and then he says i'll buy one with you and we can race eachother seriously, i was like wtf!,...