Bucket

Human beings will line up for miles to buy a bucket of catastrophes, but don't try selling sunshine and light - you'll go broke.

~ Chuck Jones 

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There are a few challenges in collecting buckets. First, where do you store them? You better have some space. Second, how do you define "bucket" as opposed to other containers? (That might not be a very big challenge, but I don't know. I haven't done any research on that topic.)

Then there is the matter of keeping a record of what buckets you own. Do you do by description? By photo? A written record or a catalogue of some kind? 

Finally, how do you complete your collection? If you collected buckets and before you died you really wanted to get a few rare / prized buckets then I guess you would have a bucket list on your bucket list.

Bucket collecting is not as simple as you think, but why are you thinking about that? Seriously, I'm sure you have better things to do.