As an Alchemist specialized in transformative potions. Sometimes a potion doesn't do what it was supposed to and your body ends up in a weird shape. Maybe something extra got mixed in on accident or the equipment was not fully cleaned leading to part of the previous made potion to linger.
In this case I drank a Bigfeet Potion. But to my shock my feet began to inflate into a pair of helium filled weather balloons! I fell over from the unexpected expansion as my feet continued to swell! The potion must of been contaminated by a balloon element when brewing. Luckily, since inflation is a somewhat common occurrence to myself. I carry an emergency rope to tie myself down. My feet became so big and inflated that they dragged me off the ground as they began to float. So I was left dangling from my giant ballooned feet, holding on to the rope so I don't float away. Hopefully the potions duration is unaffected. I did somewhat enjoy the experience. Maybe I'll make this into its own potion. A few of my potions have been made by similar accidents.