There's no single best way to craft an after hours greeting. The most important point is that you equip your customers with what they need to know, and give them an avenue to contact you, whether that's through voicemail, email, or other channels.
Consider for a moment how your phone is currently being answered. Professional courtesy is quite often not the standard for many college students. An abrupt "Yeah!" could be listed among the more courteous greetings. The more outrageous remarks will often buy you a major black mark in the professionalism category—even if it was your roommate answering your phone and acting crazy. A simple "This is ____" is always a pleasant change for a college student call. Make the change today, before the next (or first) employer phone call. If you have a landline, you should also encourage your roommate to do the same.

6. “Thanks for calling [company name]. You must be calling as you’ve heard about our new [new product, deal, offer here]. We are pretty excited about it, too. Leave us your name, number and the best time to call and we’ll follow up and answer any inquiries you may have. We’re looking forward to speaking with you and updating you on what’s new with [company name]. Have a great day!” Briefly let your callers know about any promotions, updates, or launches you’re having. You might even unknowingly answer their question!Professional voicemail greetings for your business cell phone number
At least if people who aren't the NHS or local gov't leave me voicemail, I will at this point have 0 compunction about just ignoring it because I did give them fair warning ;) Which in turn means I'm likely to call them back sooner...