Christmas Bingo Puns

Everytime B-9 comes up, he says:

"B-9... not malignant."

-____-

For some reason my entire family plays bingo every year on Christmas. And every time my dad draws and reads all the number-letter combos. And every year he waits patiently until he can say his favorite dad joke: Oh, thank goodness it's not malignant... (pause for emphasis) It's B9!