Examples:

• Trying to convince him to change his mind is like banging your head against the wall; he's extremely stubborn.
• After hours of troubleshooting, I felt like I was banging my head against the wall trying to fix the computer.
• She kept trying to reason with the unreasonable customer, but it was like banging her head against the wall.
• Attempting to find a solution to the complex math problem felt like banging my head against the wall.
• Dealing with bureaucracy often feels like banging your head against the wall; it's so frustrating.
• He refused to listen to any advice, and talking to him was like banging your head against the wall.
• When it comes to politics, some people are so set in their views that discussing it feels like banging your head against the wall.
• Trying to teach my dog not to bark at the mail carrier feels like banging my head against the wall sometimes.
• Negotiating with him is impossible; it's like banging your head against the wall.
• The project was so disorganized that it felt like everyone was banging their heads against the wall.
• After months of trying to mend their relationship, they realized it was futile and like banging their heads against the wall.
• I felt like I was banging my head against the wall when I tried to explain the concept to my students, and they still didn't understand.
• Pursuing a career in acting can sometimes feel like banging your head against the wall due to the competitiveness of the industry.
• Trying to get a response from the unresponsive customer service hotline was like banging my head against the wall.
• He continued to make the same mistakes despite our warnings, and it felt like we were banging our heads against the wall.
• Attempting to get the attention of the distracted toddler was like banging your head against the wall.
• Trying to change company policies can sometimes feel like banging your head against the wall, but it's necessary for progress.
• The constant arguments between the siblings made their parents feel like they were banging their heads against the wall.
• The lack of progress in the negotiations was frustrating, and it was like banging your head against the wall.
• Sometimes, when dealing with bureaucracy, it feels like you're banging your head against the wall just to get a simple answer.