Not too many years ago, London Transport ran an advertising campaign featuring various famous historical figures to promote how easy it is to get around the capital by tube. One of the posters had Henry VIII asking for 'a return to the Tower' then adding: 'and a single for the wife'!
Something is said or done which, though on the surface seems totally straightforward, those 'in the know' recognise as highly and (perhaps humorously) significant. That is what we call irony.
The Lord Jesus
No other life is surrounded with more irony than that of the Lord Jesus Christ. While he is the 'Bread of life' who fed the thousands, he himself suffered hunger (Matthew 4.2). While be brought healing and joy to others, he himself was a man of sorrows. While heaven was his home, he had nowhere to lay his head.