"Ironic" does not mean bad luck. Ten thousand spoons when you need a fork isn't ironic. It's spending all your money on spoons like a retard. Irony is when the opposite of what you expect occurs. Or when you say one thing, and mean another, also known as sarcasm. Or, in fiction, when the reader is aware of something that characters are not aware of which is currently relevant.
Getting run over by an ambulance is ironic, because ambulances are used to save lives. Also, it's good luck if the ambulance is empty.
"Transformers: Revenge of the Fallen had excellent writing," is ironic, and I won't explain why.
If Jon died in the hospital, and we cut to Henry saying, "Man, I sure hope Jon's getting better after being hit by that ambulance," it's ironic. Because Jon died, and Henry should probably be told that.
God, that builds rants in me.