Two Reasons I Don't Sleep Well at Night (and don't piss me off, or I'll make this a freakin' series):
1. People keep writing "lightening" when they mean to write "lightning." You can lighten your hair. After sunrise, the sky gradually "lightens." Lightning is that flash you see in the sky before you hear the thunder. (Or "lightning" could also apply to at least two great blues musicians. But I digress.)
2. "Peak" and "peek" are not interchangeable. (And don't even get me started on "pique.") No, really. Your computer's spell-checker is not a blasted mind-reader, so please learn the difference before you use either.
By the way, the illustration above is of lightning striking a mountain peak. Maybe you don't care, but I impressed the hell out of myself finding that one. Just sayin'.
(Reprinted from 4/26/11, because I've been seeing a lot of people doing the "peek/peak" thing lately.)
Thanks for your time.