A bucket list

A bucket list (slang)
Syn: to-do list

• a compilation of things one has never done but wishes to do before dying. 

A drop in the bucket (slang)

• The U.S. needs to redevelop passenger rail; Amtrak funding is just a drop in the bucket.- une goutte d'eau dans la mer 

A bucket of worms (slang)

•  slang: loose and nasty

Opening a can of worms (slang)

•  If you open a can of worms, you do something that will cause a lot of problems and is, on balance, probably going to cause more trouble than it's worth.

To kick the bucket (slang)
Syn: to die

• Did you hear that her grandfather kicked the bucket? -casser sa pipe