Review the sentence:
Squirting ketchup on the hot French fries, Gloria's shirt was stained
red in a tomato sauce explosion.
Squirting ketchup on the hot French fries, a participle phrase, comes right before shirt, an illogical target. (Gloria's, a possessive noun, functions as an adjective describing shirt.) People, not shirts, squirt ketchup!
Before you continue, review the rules for misplaced and dangling modifiers.