But one teacher managed to nail the answer and people can't believe how sweet it was.
Dan West, 51, an assistant professor at Ohio University, was teaching the final lecture in his Introduction to Human Communication class which was looking at love and relationships.
Buzzfeed reported that a student asked him: "How do you know when you're in love?"
To which the romantic professor responded: "It just hits you, you can’t expect it and you can’t plan for it."
He continued by illustrating his point with a story about his wife – who he married in 1993.
He said: "We had just come from a movie and stopped by a grocery store so I could buy some food for the next day.
"We were looking at ice cream and as I watched her choosing I realised that I was going to be buying groceries with her for the rest of my life."
One of his students Victoria Helmke – was so touched by the anecdote that she posted it on Twitter and people couldn't cope with the sentiment.
One said: "My heart just melted I think."
While another added: "Not to be dramatic but I would literally die if someone said this about me."
If that wasn't emotional enough for you check out the heartwarming moment an 11-year-old girl finds out she’s being adopted by her foster family.
And in related news, a lecturer who was abandoned in a cinema toilet when he was a baby tracked down his family 61 YEARS later with help of DNA expert.
And Long Lost Family siblings Cliff and Sue who met for the first time after they BOTH applied to the show tell of their heartbreak, when their birth mother refused to meet them.
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