nailing jelly to the wall BrE
nailing Jell-O to the wall AmE

It's a bit like nailing jelly to the wall.

A design strategy can give direction and focus to this process, but clarifying it is often about as easy as nailing jelly to the wall.

When Mr Clinton made his famous remark about nailing Jell-O to the wall, only 20m people in China were online.

McCain: Well, you know, nailing down Sen. Obama's various tax proposals is like nailing Jell-O to the wall.

In the "wild card" category were things like "Primordial Aspic," a green ooze swimming with Gummi Worms and Gummi Fish, and a Jell-O brick nailed to a board called "Tougher Than Nailing Jell-O to the Wall."