(Print) Use this randomly generated list as your call list when playing the game. There is no need to say the BINGO column name. Place some kind of mark (like an X, a checkmark, a dot, tally mark, etc) on each cell as you announce it, to keep track. You can also cut out each item, place them in a bag and pull words from the bag.
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too many different stat blocks in combat
overuses rule of cool
overestimating the players
afraid to tell players NO
incoherent NPC motivations
overuse of time travel
not sleeping before the session
over-prepping for the session
no plan for campaign end
making death meaningless
excessive worldbuilding
everything is a fetch quest
doesn't read player backstories
underestimating the players
WAY too ambitious
never writes ideas down
doesn't vet the character sheets
afraid to tell players YES
way too much exposition
abusing rule zero (DM always has final say)
the DM forgetting they're ALSO a player and their fun matters at the table too