Butter

In case there was any doubt that these are my kids...

They've started sneak-eating straight up butter when I'm not around. Once last week and then again today. It was pretty much a full stick this morning when I buttered my toast. Now? Not so much. 

Last week, they were at least dipping wheat thins in it, but this time it was just with their hands I think. My kids have gotten very michevious in the last several weeks and I'm going to have to start locking up all of the crayons, scissors, and ...butter. 

Any suggestions?