From Keith Devlin
"Multiplication is not the same as repeated addition", as put forward in Devlin's MAA column.
I'm not really sure how I feel about this one; I might be one of the unfortunate souls who are still prey to that delusion.
In case you missed it, the column ended up spilling a lot of electronic ink (as evidenced in this follow-up column), so I don't believe it would be wise to start yet a new one on MO. Thanks in advance!