I wouldn't be excited if I were on a pointy stick.
Seamus wasn't accepted. It should be; it's his name.
You're spelling it the Irish way, but I'll add it.
Would it also be correct to say "Tha Seumas bhioran"? Or is excited a different verb tense here and I haven't noticed?!
No; air bhioran is an idiom that means "excited"-- it literally translates as "on sharp, pointy things".
I literally just had another question with James right before this one, where Seamus was accepted for James.
I couldn't work out why I was getting this answer wrong.