Believe it or not, in ASL, if a mouth movement changes, the meaning of the sign changes even though the sign looks exactly the same.

sign 1
​sick 
hilarious
disappointed 
funny, stop that 
LoL

sign 2
finish
hands off
mind-boggling
that's all

sign 3
​awful
impossible
believe it or not

sign 4
wrong
accidently
unexpected
what matters?

sign 5
good
see ya later
best