My favorite part about Lent is accidentally harassing my girlfriend. For example, you're apparently supposed to fast on Ash Wednesday, something I didn't know. I spent the whole day eating in front of her and even brought food to her apartment, continually forgetting that she couldn't eat a lot that day. Personally, I think fasting is ridiculous, but each to their own.
She also gave up sweets, and now (Friday) I continue to accidentally offer her candy or tell her about how many oreos I had while watching Archer last night (at least 10.)