What is it about the letter "I"?

Lexi has a few Alphabet sets:

A foam set for the bath tub

A wooden puzzle

and A magnetic set

Each time she plays with them and a letter inevitably ends up in her mouth, it's the letter "I". Why? Does it look like a popsicle? A candy? I don't know. But it's always that letter first. She looks for it first, before attempting to eat every other letter after I've taken away the "I". It's become a game. It's also the smallest piece, which is the only reason for concern...most pieces won't fit all the way in her mouth, but those "I"'s sure do. The foam one is pretty mutilated at this point.