They need to raise thousands of dollars for this project, so our 20-dollar donation is just 'a drop in the bucket'.
It's raining 'buckets'. = The rain is coming down 'in buckets'. [=it's raining very hard]
The rain is really 'bucketing down'. = It's 'bucketing down'. [=it's pouring]
(..) now we will begin to proceed to obtain your I.Q. and "apitude" tests. What for? Okay, sir, this is to figure out what your "aptude's" good at... If you have one bucket that holds two gallons... and another bucket that holds five gallons... how many buckets do you have? Two? (..)2006 Idiocracy