I love the study of languages. Indo-European languages especially.
My mother is Colombian, but I was born in the States, so I grew up speaking Spanish at home and learned English from TV and school.
Being bilingual fueled my love for languages. I would love to compare English and Spanish cognates.
Some examples:
Commence - comenzar
Obedience - obediencia
Salute - saludar
I often found myself sounding more sophisticated than my friends because I would use the Spanish word in English.
For example, I was discussing something with my friend and I remember I used the term aggrandize. I could have used something more English sounding like inflate or boast, but aggrandize came naturally because of my Spanish substrate. Not that there is an exact cognate, but 'engrandecer' came first to my thoughts, and so out came aggrandize. I even had to look it up later in the dictionary to make sure I was speaking properly, and it turns out that yes aggrandize does exist.
One of my best life friend that I met in middle school was Brazilian and spoke Portuguese. I was fascinated with that language as well, it's so similar to Spanish. So I self taught myself a bit. There are some false friends you have to be aware of though.
Embarazada in Spanish is pregnant, where as embaraçada in Portuguese is the same as in English, embarrassed.
To top it off, my dad is Romanian. I got a chance to pick up another Romance language and use it. The grammar is more difficult than the other Romance languages, but I honestly didn't find it too difficult to pick up the basics, because of the Latin roots of all Romance languages.
It just fascinates me how languages evolved over time.