Ever since reading this article on the differences between Helvetica and Arial, I will
always definitely pay special attention to signages and other type-centered designs in an attempt to name the font used. That's incredibly geeky but if it's being geeky in my field of profession and interest, I am willing to absorb all the geekery involved.

The one at the top is Helvetica,
the one at the bottom is Arial.
Notice the "R", the "t", the "a". These are the more noticeable differences.
Absorb them in.
You are now infected with the "Can't stop looking at signs" disease, you will now stop in your steps just to see whether that "R" has a little curve on its tail. I just don't want to be the only one so distracted with little stuff like that, thanks for joining me.
Also, I came upon the realisation that the guy who invented the word "subtle" must have been a genius. Just look at how it's spelled and pronounced, you will know why I'm so excited over it.
I'm quite bored, you can tell?