What the fuck is this shit? Next time, add mature content because this shit is sick like you stupid furfaggots. I hope all bronies die, and remember that. I'm going to spam this comment on all the stupid furfags I see here.
Have a mac? Go to your system prefs, international, input menu, check the "show input menu in the...". In the menu bar, click the flag and click the "show character palette", then look under punctuation.
If you have a windows, the All Knowing Wikipedia says: "The interrobang can be used in some word processors with the alt code ALT+8253 when working in a font that supports the interrobang, or using an operating system that performs font substitution."