I have common fears like spiders and I'm (somewhat) afraid of heights, but I also think I have a couple strange fears?
I'm afraid of being on boats, but I feel like I'm really good at hiding it. I never learned how to swim and I've had a couple experiences where I've almost drowned, so it's been really scary for me. Once a long-distance friend came to visit from another country with his family, and his mom suggested we go whale watching, which requires me to be on a boat for several hours. They had already bought the tickets, and I didn't have the heart to say no to them...
I only think I'm good at hiding it because they never said anything to me afterwards, and because I agreed to go on a ferry with my parents a few years ago even though they knew of my fear, and my dad said it seemed like it was no problem for me.
I've been teased a couple times for this but... I'm also afraid of vacuums. I like cleaning and having a clean space but they're so extremely loud, and hearing such a loud noise, even when I'm expecting it, in my own home is scary for me. I used to live in a room that was fully carpeted, and I'll admit I asked my mom to vacuum it for me a few too many times...