If you are using Chrome and:
your resolution is 1366x768
Your window is maximized
A link is the last word of the last line of the message
Then, if you attempt to click on the the link is covered by ...
I joined the chat at dba.stackexchange.com and was quite surprised to find it was pretty active (at least during work hours, which is usually when I'm around)
I soon figured out that was because the ...