Windows users, open Outlook and start an email (new or reply, doesn't matter). Type something in the message body, then press alt+X.
For those who can't be bothered or don't have outlook, it converts the character to the left of the cursor into its ASCII value (in hex, so space becomes 0020).
Just for fun, I tried it on a mac, and all I got was a squiggly equals sign (I like to call it a supertilde)
[ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776]
[ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776][ch8776]
Trying other key combos, here's the alt+letter alphabet:
I greatly prefer the mac's process to add accent marks. It makes so much more sense than ALT+345 (random number, I don't actually know the alt codes)
Oh, and also:
ALT + n + letter = ñ
Although it's just a NORMAL tilde...
PS on a side note, my favorite punctuation mark can be made with the font Wingdings 2, just type a ^ or _ or [ for threee different options.
I'm totally using interrobangs in my english papers next year!
Whatever is on the left side of it with whatever is to the right of it.
3.14159265 + 39 [ch8776] 42
Also, I had to find out how to do this on linux: Alt Codes
Instead of "alt", one must press CTRL + SHIFT + U, then release U, then type a unicode hexadecimal nr, then release ctrl and shift. Alternatively, ctrl + shift + u, release everything, type the unicode hex nr, then press space.