You can’t underestimate the power of a brew.
It can be used as a reward for completing a story/scenario/bdd test step. But where it’s most useful is problem solving.
The act of simply getting up, away from the computer, grabbing your pair or colleague and talking through what the issue is magically solves any problem (yes any*!). You generally find you solve the problem yourself whilst explaing it to someone. You’ve got at the very least 4 minutes whilst the kettle boils and the bag steeps.
So when a colleague comes to you with pleading eyes asking if you want a brew, go and put the kettle on and your listening hat on.
TeaDD for the win.
*note this all depends on the tea you use. I find Clipper every day tea has the most potent magical properties, wheras @Plip prefers twinings everyday (NOT organic as you can’t trust them for consistence) and others swear by Earl Grey (with lemon you dirty bastards).