Not swallowing is just plain ignorant.
Haven't had an opportunity to catch it yet. All things considered I'll try nearly anything once. A lot of what we eat on a regular basis could at one point (or even now) have been considered "weird" or "strange."
For that matter, if I had to think of some of the weirder stuff I've eaten over the years... wow. :D
So, a short list:
Sweetbreads (the thymus gland of veal. disappears within a few months of growth)
Boudon Noir (blood sausage. so good)
Oysters (many, many types)
Livers (chicken, foie gras, monkfish, calve's, I'll eat it)
Tripe (not a huge fan)
Pig trotters (delicious!!)
Most sashimi/sushi comes into this category... I prefer the weirder stuff like uni.
Be adventurous, don't just eat Mac & Cheese or burgers!