Isn't P-R-O-M F-U-N?

[the_c_and_cake]

Take away the "p" in prom and replace it with a "f" and you have from.
Take away the "m" in from and replace it with nothing and you have fro.
Switch the "o" and the "r" in the word fro and you end up with the word for.
Take the first letters that I mentioned in each of the three sentences preceding this one and spell as many words as you can.
Did you figure them out?
The answers are mop and pom like in "pom pom".