Take a shot when:
- Saitama goes from Goofy Face to Serious Face. (And vice-versa)
- Saitama wipes out a monster with one punch.
- Genos refers to Saitama as Sensei or Master.
- Tornado acts bratty.
- Monsters, criminals, or minor heroes boast about how powerful they are only to be curb-stomped by their opponent. Take a second drink if that opponent is Saitama.