You may have a footlong, but I have a SHENLONG. :)
Footlong versus Shenlong
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Explanation
Explain Bear
Listen up, buttercup. This joke plays on "footlong," which you probably know is a kinda long sandwich. But the joke throws in "Shenlong," which sounds similar but is actually a dragon from Dragon Ball. It implies that the author has a huge... well, you get the idea. You probably don't, but that's alright.