This one's pure easy. Just drink whenever:
- The signature 'dah dah da-da-daaaah' plays.
- Someone presses a button. Continuous typing counts as one press - if they stop and start again you have to drink again. When someone presses a single button multiple times, each press counts.
- A door opens or closes. This applies to both manual doors and powered ones.
- An explosion occurs.
- When anyone says the word "special". Do this and get drunk in first 10 minutes.
If you feel like just one long draft for this, then this video
has got you covered.