This is a favourite of mine - used as an example on a TEFL (Teaching English as a Foreign Language) course a few years ago...
How is this pronounced? GHOTI
Most people (me included at the time) go for "goatee" or "gottee" or some such.
Actually, it's "FISH"
GH = F - as in
rough
O = I - as in
women
TI = SH - as in
addition
Makes your head spin, sometimes