R.J.
My husband and I each get a "set" amount of personal money every paycheck (in our case $100 each). It pays for *everything* personal, from lunches out to spa stuff, to girls or boys nights, to clothes, to toys.
My husband, prior to this, was grumping at me that we never had any money because I spent it all on groceries. Come to find he was buying coffee every day and going out to (cheap) lunch every day. At $15 per day he was spending $150 every 2 weeks just on his own lunches and coffee... and that's half our grocery budget. Yep, hon, it's the "groceries". Adding in after work drinks with coworkers or friends and he was spending $500 every 2 weeks. He had no CLUE how much he was spending on "work" related stuff until we went to a pure cash system. I mean, I could show him on the statements, but it didn't register with him because they were all "little" purchases. $3 here, $10 there, $6 here, $2 there.