L-bomb
Using the word 'love' to a friend or lover for the first time. It's like telling a dog you're gonna take it to the park, and everyone around you immediately starts betting on how long it'll last.
'I love you' said to your crush after a really bad math test.
'I love you' texted to your best friend right before you got into a huge fight.
'I love you' said in the middle of a video game battle.