If I had a euro for every stupid thing I've done, I could buy the book: Anna and the French Kiss, by Stephanie Perkins. This quote reflects a humorous and self-deprecating attitude towards one's past mistakes, implying that the speaker has made numerous errors worth a substantial amount of money.
The quote highlights the idea of learning from past mistakes and perhaps embracing humor about one's own flaws. It suggests that the speaker might see their missteps as part of their growth and doesn't take themselves too seriously, making it a relatable and amusing remark.