The joke is that a clueless American signed up for the wrong IRA but end up agreeing with the anti-British rhetoric

That’s the joke. An American is trying to start an IRA for themselves, and wound up at wildly the wrong institution.

🎵🎶 Haaaang Down, Ya Blood red roses, Hang Doooown

Oh, ya Pinks and Posies! 🎶🎵

26+6=1