Awl --
I live by 5 gal buckets -- at any given time, I have between 25 and 60, depending on how reliable neighbors are about returning them. :)
Hammering them apart, tho, is a real pita. Sometimes you *really* gotta hammer! How to keep them from sticking?
Thinking one or two sheetrock screws to just stop full insertion. Thought of a line of epoxy on the outside to keep them from "sealing".
It's not, I don't believe, a vacuum problem, in which case a simple hole in the bottom would suffice.
Any ingenious solutions out there?