Things that have a similar effect to the typhoid vaccine:

-Being punched in the arm by Aidan Duggan in second year, when you told him to go fuck himself and his french homework.

-Falling asleep on the floor after a party, and waking up to realise you've spent the whole night asleep on an upturned plug.

-That one time in work when it was really quiet, and you were reading health websites and imagining you were having a heart attack. (although that wasn't real, more the effect of call centre coffee and hypochondria)

-Being punched in the arm by your friend Conor in 5th class when you said 'there's no such thing as a dead arm'

-An experimental phase in 6th class where you decided that you would no longer feel pain. And Conor decided to test that with punching. To your credit, you kept up the pretence until he got tired and admitted that no, you probably couldn't feel pain. you rule.

-That time you drunkenly said that Australian girl had a nice ass. Yeah, you paid for that one. And you were wrong, she didn't laugh, and find it ironic. Because although you meant it ironically...Yeah, you don't come off well out of this one, quit while you're ahead.

-Stabbing yourself surreptitiously in the arm with a biro in an effort to stay awake during a lecture entitled 'TV Drama & Social History; critiqueing Dallas and Dynasty from a Marxist perspective'.