Yes, here's another installment of 'common mistakes I see while reading.'
This one's a doozy because it's a 3 way one.
Peak - it's the top of something, a mountain, the highest point. "The temperature is at its peak around midday." Or, "We climbed the mountain until we reached its peak."
Peek - a sneaky little look at something. "I took a peek at the candy hidden under the counter."
Pique - it's anger, but usually fairly mild or irrational anger. "He stormed off in a fit of pique." Interestingly, this can also be used to mean you're intrigued, "The story piqued my interest."
I keep seeing these three being mixed up and it irritates me. So I thought I'd just do a helpful public service by clearing that one up....