We would send emails to the office from unlocked machines.

e.g, long detailed emails about my little pony and asking to start a company My Little Pony fanclub.

Or similar for Celine Dion etc.

Change their wallpaper to something embarrasing, or their homepage etc.

Or just send out an email to everyone in the company saying how much you love everyone, and how lucky you feel to work with such lovely people xxx

In my experience, when someone refused was because he/she forgot to bring the reward. Some time ago, before Slack, we used to type "donuts" in the email's composer and send the message to the team's mailing list or to the full office.

Imagine your co-worker on the next day with two or three dozens of Krispy Kreme products.

I don't think you can enforce this, would be horrible for morale and probably illegal. I like to have similar "punishments" in my teams, people generally have fun with it. (And the rules apply to me too of course) But if someone doesn't want to, they can just ignore it. (Usually 1 in 10-20)

Multiple teams I've been on at multiple companies have done this process, but with donuts and other foods. A little bit of public shame goes a long way.

As our team is growing, having to bring cookies for a larger group can be a lot. Also, you're a bit less inclined if this happens to you two days in a row...

(message for Tyler: we're still waiting on those cookies)

This is exactly what the team I'm in does as well. It's fun, and people actually learn to lock their machines as a routine pretty quickly.

It's not something we hardcore enforce, since it's more about having a fun way to build good security habits with your devices. Being lightly called out in Slack has an impact in and of itself. The actual cookies are just a bonus. But people do like cookies, so there is some social pressure from your peers asking when the cookies are coming!

I'd be more inclined to do a "drinks" option.

Except for those that obstain. Of course, not all people can eat cookies either, I suppose.

It doesn't even have to be alcoholic drinks

Psst…I think you meant "abstain".

whoops

Solid milk chocolate! ;-)

A new take on "jinx you owe me a soda"